Dual metallocene catalyst systems for decreasing melt index and increasing polymer production rates

ABSTRACT

The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.

REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. patentapplication Ser. No. 13/888,419, filed on May 7, 2013, now U.S. Pat. No.8,748,546, which is a continuation application of U.S. patentapplication Ser. No. 13/681,443, filed on Nov. 20, 2012, now U.S. Pat.No. 8,450,436, which is a continuation application of U.S. patentapplication Ser. No. 12/824,363, filed on Jun. 28, 2010, now U.S. PatNo. 8,329,834, which claims the benefit of U.S. Provisional ApplicationSer. No. 61/221,222, filed on Jun. 29, 2009, the disclosures of whichare incorporated herein by reference in their entirety.

BACKGROUND OF TIE INVENTION

The present invention relates generally to the field of olefinpolymerization catalysis, metallocene catalyst compositions, methods forthe polymerization and copolymerization of olefins, and polyolefins.With certain catalyst systems and polymerization processes, it can bedifficult to produce a polyolefin having either a high molecular weightor a low melt index. Further, in situations where a high molecularweight or low melt index polymer can be produced, often the productionrate in a commercial polymerization reactor may have to be reduced.

Hence, it would be beneficial to produce polyolefins using ametallocene-based catalyst system, where high molecular weight or lowmelt index polymers can be produced, and at commercially viableproduction rates. Accordingly, it is to these ends that the presentinvention is directed.

SUMMARY OF THE INVENTION

The present invention discloses polymerization processes which employdual catalyst systems for the production of polymers with highermolecular weights, with lower melt indices, and at increased productionrates. These polymerization processes can comprise:

contacting a catalyst composition with an olefin monomer and optionallyan olefin comonomer under polymerization conditions to produce an olefinpolymer,

wherein the catalyst composition comprises catalyst component I,catalyst component II, and an activator.

In one aspect, an amount of the olefin polymer produced per hour by theprocess is at least 10% greater than an amount of an olefin polymerobtained per hour under the same polymerization conditions withoutcatalyst component II.

In another aspect, a weight-average molecular weight (Mw) of the olefinpolymer produced by the process is at least 10% greater than aweight-average molecular weight (Mw) of an olefin polymer obtained underthe same polymerization conditions without catalyst component II.

In these and other aspects of this invention, catalyst component I cancomprise a metallocene compound having formula (C), a metallocenecompound having formula (D), or any combination thereof, wherein:

formula (C) is

wherein:

M³ is Zr or Hf;

X⁴ and X⁵ are independently F; Cl; Br; I; methyl; benzyl; phenyl; H;BH₄; OBR₂ or SO₃R, wherein R is an alkyl or aryl group having up to 18carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, ora hydrocarbylsilyl group, any of which having up to 18 carbon atoms;

E³ is a bridging group selected from:

-   -   a cyclic or heterocyclic bridging group having up to 18 carbon        atoms,    -   a bridging group having the formula >E^(3A)R^(7A)R^(8A), wherein        E^(3A) is C or Si, and R^(7A) and R^(8A) are independently H or        a hydrocarbyl group having up to 18 carbon atoms,    -   a bridging group having the formula:        —CR^(7B)R^(8B)—CR^(7C)R^(8C)—, wherein R^(7B), R^(8B), R^(7C),        and R^(8C) are independently H or a hydrocarbyl group having up        to 10 carbon atoms, or    -   a bridging group having the formula        —SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—, wherein R^(7D), R^(8D), R^(7E),        and R^(8E) are independently H or a hydrocarbyl group having up        to 10 carbon atoms;

R⁹ and R¹⁰ are independently H or a hydrocarbyl group having up to 18carbon atoms; and

Cp¹ is a cyclopentadienyl or indenyl group, any substituent on Cp¹ is iior a hydrocarbyl or hydrocarbylsilyl group having up to 18 carbon atoms;and

formula (D) is

wherein:

M⁴ is Zr or Hf;

X⁶ and X⁷ are independently F; Cl; Br; I; methyl; benzyl; phenyl; H;BH₄; OBR₂ or SO₃R, wherein R is an alkyl or aryl group having up to 18carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, ora hydrocarbylsilyl group, any of which having up to 18 carbon atoms;

E⁴ is a bridging group selected from:

-   -   a cyclic or heterocyclic bridging group having up to 18 carbon        atoms,    -   a bridging group having the formula >E^(4A)R^(12A)R^(13A),        wherein E^(4A) is C or Si, and R^(12A) and R^(13A) are        independently H or a hydrocarbyl group having up to 18 carbon        atoms,    -   a bridging group having the formula        —CR^(12B)R^(13B)—CR^(12C)R^(13C)—, wherein R^(12B), R^(13B),        R^(12C), and R^(13C) are independently H or a hydrocarbyl group        having up to 10 carbon atoms, or    -   a bridging group having the formula        —SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—, wherein R^(12D), R^(13D),        R^(12E), and R^(13E) are independently H or a hydrocarbyl group        having up to 10 carbon atoms; and

R¹⁴, R¹⁵, R¹⁶, and R¹⁷ are independently H or a hydrocarbyl group havingup to 18 carbon atoms.

Additionally, the catalyst composition comprises catalyst component II,which can comprise one or more of the following compounds:

a compound having the formula

or any combination thereof, wherein:

M⁵ is Zr or Hf;

X⁸ and X⁹ are independently F; Cl; Br; I; methyl; benzyl; phenyl; H;BH₄; OBR₂ or SO₃R, wherein R is an alkyl or aryl group having up to 18carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, ora hydrocarbylsilyl group, any of which having up to 18 carbon atoms;

Cp² and Cp³ are independently a cyclopentadienyl or indenyl, anysubstituent on Cp² and Cp³ is independently H or a hydrocarbyl grouphaving up to 18 carbon atoms; and

E⁵ is a bridging group having the formula —(CH₂)_(n)—, wherein n is aninteger from 2 to 8, inclusive.

Polymers produced from the polymerization of olefins using thesecatalyst systems, resulting in homopolymers, copolymers, and the like,can be used to produce various articles of manufacture.

BRIEF DESCRIPTION OF THE FIGURE

FIG. 1 presents the structures and abbreviations for certain metallocenecompounds discussed herein.

DEFINITIONS

To define more clearly the terms used herein, the following definitionsare provided. To the extent that any definition or usage provided by anydocument incorporated herein by reference conflicts with the definitionor usage provided herein, the definition or usage provided hereincontrols.

The term “polymer” is used herein generically to include olefinhomopolymers, copolymers, terpolymers, and so forth. A copolymer isderived from an olefin monomer and one olefin comonomer, while aterpolymer is derived from an olefin monomer and two olefin comonomers.Accordingly, “polymer” encompasses copolymers, terpolymers, etc.,derived from any olefin monomer and comonomer(s) disclosed herein.Similarly, an ethylene polymer would include ethylene homopolymers,ethylene copolymers, ethylene terpolymers, and the like. As an example,an olefin copolymer, such as an ethylene copolymer, can be derived fromethylene and a comonomer, such as 1-butene, 1-hexene, or 1-octene. Ifthe monomer and comonomer were ethylene and 1-hexene, respectively, theresulting polymer would be categorized an as ethylene/1-hexenecopolymer.

In like manner, the scope of the term “polymerization” includeshomopolymerization, copolymerization, terpolymerization, etc. Therefore,a copolymerization process would involve contacting one olefin monomer(e.g., ethylene) and one olefin comonomer (e.g., 1-hexene) to produce acopolymer.

Hydrogen in this disclosure can refer to either hydrogen (H₂) which isused in a polymerization process, or a hydrogen atom (H), which can bepresent on the metallocene compounds disclosed herein. When used todenote a hydrogen atom, hydrogen will be displayed as “H,” whereas ifthe intent is to disclose the use of hydrogen in a polymerizationprocess, it will simply be referred to as “hydrogen.”

The term “co-catalyst” is used generally herein to refer toorganoaluminum compounds that can constitute one component of a catalystcomposition. Additionally, “co-catalyst” can refer to other componentsof a catalyst composition including, but not limited to, aluminoxanes,organoboron or organoborate compounds, and ionizing ionic compounds, asdisclosed herein, when used in addition to an activator-support. Theterm “co-catalyst” is used regardless of the actual function of thecompound or any chemical mechanism by which the compound may operate. Inone aspect of this invention, the term “co-catalyst” is used todistinguish that component of the catalyst composition from themetallocene compound(s).

The terms “chemically-treated solid oxide,” “activator-support,”“treated solid oxide compound,” and the like, are used herein toindicate a solid, inorganic oxide of relatively high porosity, which canexhibit Lewis acidic or Brønsted acidic behavior, and which has beentreated with an electron-withdrawing component, typically an anion, andwhich is calcined. The electron-withdrawing component is typically anelectron-withdrawing anion source compound. Thus, the chemically-treatedsolid oxide can comprise a calcined contact product of at least onesolid oxide with at least one electron-withdrawing anion sourcecompound. Typically, the chemically-treated solid oxide comprises atleast one acidic solid oxide compound. The terms “support” and“activator-support” are not used to imply these components are inert,and such components should not be construed as an inert component of thecatalyst composition. The activator-support of the present invention canbe a chemically-treated solid oxide. The term “activator,” as usedherein, refers generally to a substance that is capable of converting ametallocene component into a catalyst that can polymerize olefins, orconverting a contact product of a metallocene component and a componentthat provides an activatable ligand (e.g., an alkyl, a hydride) to themetallocene, when the metallocene compound does not already comprisesuch a ligand, into a catalyst that can polymerize olefins. This term isused regardless of the actual activating mechanism. Illustrativeactivators include activator-supports, aluminoxanes, organoboron ororganoborate compounds, ionizing ionic compounds, and the like.Aluminoxanes, organoboron or organoborate compounds, and ionizing ioniccompounds generally are referred to as activators if used in a catalystcomposition in which an activator-support is not present. If thecatalyst composition contains an activator-support, then thealuminoxane, organoboron or organoborate, and ionizing ionic materialsare typically referred to as co-catalysts.

The term “fluoroorgano boron compound” is used herein with its ordinarymeaning to refer to neutral compounds of the form BY₃. The term“fluoroorgano borate compound” also has its usual meaning to refer tothe monoanionic salts of a fluoroorgano boron compound of the form[cation]⁺[BY₄]⁻, where Y represents a fluorinated organic group.Materials of these types are generally and collectively referred to as“organoboron or organoborate compounds.”

The term “metallocene.” as used herein, describes a compound comprisingat least one η³ to η⁵-cycloalkadienyl-type moiety, wherein η³ toη⁵-cycloalkadienyl moieties include cyclopentadienyl ligands, indenylligands, fluorenyl ligands, and the like, including partially saturatedor substituted derivatives or analogs of any of these. Possiblesubstituents on these ligands may include H, therefore this inventioncomprises partially saturated ligands such as tetrahydroindenyl,tetrahydrofluorenyl, octahydrofluorenyl, partially saturated indenyl,partially saturated fluorenyl, substituted partially saturated indenyl,substituted partially saturated fluorenyl, and the like. In somecontexts, the metallocene is referred to simply as the “catalyst,” inmuch the same way the term “co-catalyst” is used herein to refer to, forexample, an organoaluminum compound.

The terms “catalyst composition,” “catalyst mixture,” “catalyst system,”and the like, do not depend upon the actual product or compositionresulting from the contact or reaction of the initial components of theclaimed catalyst composition/mixture/system, the nature of the activecatalytic site, or the fate of the co-catalyst, the metallocenecompound(s), any olefin monomer used to prepare a precontacted mixture,or the activator (e.g., activator-support), after combining thesecomponents. Therefore, the terms “catalyst composition,” “catalystmixture,” “catalyst system,” and the like, encompass the initialstarting components of the composition, as well as whatever product(s)may result from contacting these initial starting components, and thisis inclusive of both heterogeneous and homogenous catalyst systems orcompositions.

The term “contact product” is used herein to describe compositionswherein the components are contacted together in any order, in anymanner, and for any length of time. For example, the components can becontacted by blending or mixing. Further, contacting of any componentcan occur in the presence or absence of any other component of thecompositions described herein. Combining additional materials orcomponents can be done by any suitable method. Further, the term“contact product” includes mixtures, blends, solutions, slurries,reaction products, and the like, or combinations thereof. Although“contact product” can include reaction products, it is not required forthe respective components to react with one another. Similarly, the term“contacting” is used herein to refer to materials which may be blended,mixed, slurried, dissolved, reacted, treated, or otherwise contacted insome other manner.

The term “precontacted” mixture is used herein to describe a firstmixture of catalyst components that are contacted for a first period oftime prior to the first mixture being used to form a “postcontacted” orsecond mixture of catalyst components that are contacted for a secondperiod of time. Typically, the precontacted mixture describes a mixtureof metallocene compound (one or more than one), olefin monomer (ormonomers), and organoaluminum compound (or compounds), before thismixture is contacted with an activator-support(s) and optionaladditional organoaluminum compound. Thus, precontacted describescomponents that are used to contact each other, but prior to contactingthe components in the second, postcontacted mixture. Accordingly, thisinvention may occasionally distinguish between a component used toprepare the precontacted mixture and that component after the mixturehas been prepared. For example, according to this description, it ispossible for the precontacted organoaluminum compound, once it iscontacted with the metallocene compound(s) and the olefin monomer, tohave reacted to form at least one different chemical compound,formulation, or structure from the distinct organoaluminum compound usedto prepare the precontacted mixture. In this case, the precontactedorganoaluminum compound or component is described as comprising anorganoaluminum compound that was used to prepare the precontactedmixture.

Additionally, the precontacted mixture can describe a mixture ofmetallocene compound(s) and organoaluminum compound(s), prior tocontacting this mixture with an activator-support(s). This precontactedmixture also can describe a mixture of metallocene compound(s), olefinmonomer(s), and activator-support(s), before this mixture is contactedwith an organoaluminum co-catalyst compound or compounds.

Similarly, the term “postcontacted” mixture is used herein to describe asecond mixture of catalyst components that are contacted for a secondperiod of time, and one constituent of which is the “precontacted” orfirst mixture of catalyst components that were contacted for a firstperiod of time. Typically, the term “postcontacted” mixture is usedherein to describe the mixture of metallocene compound(s), olefinmonomer(s), organoaluminum compound(s), and activator-support(s) formedfrom contacting the precontacted mixture of a portion of thesecomponents with any additional components added to make up thepostcontacted mixture. Often, the activator-support comprises achemically-treated solid oxide. For instance, the additional componentadded to make up the postcontacted mixture can be a chemically-treatedsolid oxide (one or more than one), and optionally, can include anorganoaluminum compound which is the same as or different from theorganoaluminum compound used to prepare the precontacted mixture, asdescribed herein. Accordingly, this invention may also occasionallydistinguish between a component used to prepare the postcontactedmixture and that component after the mixture has been prepared.

Although any methods, devices, and materials similar or equivalent tothose described herein can be used in the practice or testing of theinvention, the typical methods, devices and materials are hereindescribed.

All publications and patents mentioned herein are incorporated herein byreference for the purpose of describing and disclosing, for example, theconstructs and methodologies that are described in the publications,which might be used in connection with the presently describedinvention. The publications discussed throughout the text are providedsolely for their disclosure prior to the filing date of the presentapplication. Nothing herein is to be construed as an admission that theinventors are not entitled to antedate such disclosure by virtue ofprior invention.

For any particular compound disclosed herein, any general or specificstructure presented also encompasses all conformational isomers,regioisomers, and stereoisomers that may arise from a particular set ofsubstituents, unless stated otherwise. Similarly, unless statedotherwise, the general or specific structure also encompasses allenantiomers, diastereomers, and other optical isomers whether inenantiomeric or racemic forms, as well as mixtures of stereoisomers, aswould be recognized by a skilled artisan.

Applicants disclose several types of ranges in the present invention.These include, but are not limited to, a range of number of atoms, arange of weight ratios, a range of molar ratios, a range oftemperatures, and so forth. When Applicants disclose or claim a range ofany type, Applicants' intent is to disclose or claim individually eachpossible number that such a range could reasonably encompass, includingend points of the range as well as any sub-ranges and combinations ofsub-ranges encompassed therein. For example, when the Applicantsdisclose or claim a chemical moiety having a certain number of carbonatoms, Applicants' intent is to disclose or claim individually everypossible number that such a range could encompass, consistent with thedisclosure herein. For example, the disclosure that a moiety is a C₁ toC₁₂ alkyl group, or in alternative language having from 1 to 12 carbonatoms, as used herein, refers to a moiety that can be selectedindependently from an alkyl group having 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,11, or 12 carbon atoms, as well as any range between these two numbers(for example, a C₁ to C₆ alkyl group), and also including anycombination of ranges between these two numbers (for example, a C₂ to C₄and C₆ to C₈ alkyl group).

Similarly, another representative example follows for the molar ratio ofcatalyst component I to catalyst component II in a catalyst compositionprovided in one aspect of this invention. By a disclosure that the molarratio of catalyst component I to catalyst component II is in a rangefrom about 7:1 to about 50:1, Applicants intend to recite that the molarratio can be about 7:1, about 8:1, about 9:1, about 10:1, about 11:1,about 12:1, about 13:1, about 14:1, about 15:1, about 16:1, about 17:1,about 18:1, about 19:1, about 20:1, about 21:1, about 22:1, about 23:1,about 24:1, about 25:1, about 26:1, about 27:1, about 28:1, about 29:1,about 30:1, about 31:1, about 32:1, about 33:1, about 34:1, about 35:1,about 36:1, about 37:1, about 38:1, about 39:1, about 40:1, about 41:1,about 42:1, about 43:1, about 44:1, about 45:1, about 46:1, about 47:1,about 48:1, about 49:1, or about 50:1. Additionally, the molar ratio canbe within any range from about 7:1 to about 50:1 (for example, the molarratio is in a range from about 8:1 to about 15:1), and this alsoincludes any combination of ranges between about 7:1 and about 50:1 (forexample, the molar ratio is in a range from about 7:1 to about 15:1 orfrom about 20:1 to about 30:1). Likewise, all other ranges disclosedherein should be interpreted in a manner similar to these two examples.

Applicants reserve the right to proviso out or exclude any individualmembers of any such group, including any sub-ranges or combinations ofsub-ranges within the group, that can be claimed according to a range orin any similar manner, if for any reason Applicants choose to claim lessthan the full measure of the disclosure, for example, to account for areference that Applicants may be unaware of at the time of the filing ofthe application. Further, Applicants reserve the right to proviso out orexclude any individual substituents, analogs, compounds, ligands,structures, or groups thereof, or any members of a claimed group, if forany reason Applicants choose to claim less than the full measure of thedisclosure, for example, to account for a reference that Applicants maybe unaware of at the time of the filing of the application.

The terms “a,” “an,” “the,” etc., are intended to include pluralalternatives, e.g., at least one, unless otherwise specified. Forinstance, the disclosure of “an activator-support,” “an organoaluminumcompound,” or “a metallocene compound” is meant to encompass one, ormixtures or combinations of more than one, activator-support,organoaluminum compound, or metallocene compound, respectively.

While compositions and methods are described in terms of “comprising”various components or steps, the compositions and methods can also“consist essentially of” or “consist of” the various components orsteps. For example, a catalyst composition of the present invention cancomprise; alternatively, can consist essentially of; or alternatively,can consist of; (i) catalyst component I, (ii) catalyst component II,(iii) an activator-support, and (iv) an organoaluminum compound.

DETAILED DESCRIPTION OF THE INVENTION

The present invention is directed generally to catalyst compositions,methods for preparing catalyst compositions, methods for using thecatalyst compositions to polymerize olefins, the polymer resins producedusing such catalyst compositions, and articles produced using thesepolymer resins. In one aspect, the present invention relates to anolefin polymerization process, said process comprising:

contacting a catalyst composition with an olefin monomer and optionallyan olefin comonomer under polymerization conditions to produce an olefinpolymer,

wherein the catalyst composition comprises catalyst component I,catalyst component II, and an activator (e.g., an activator-support and,optionally, an organoaluminum compound), and

wherein an amount of the olefin polymer produced per hour by the processis at least 10% greater than an amount of an olefin polymer obtained perhour under the same polymerization conditions without catalyst componentII.

In another aspect, an olefin polymerization process is provided and, inthis aspect, the process comprises:

contacting a catalyst composition with an olefin monomer and optionallyan olefin comonomer under polymerization conditions to produce an olefinpolymer,

wherein the catalyst composition comprises catalyst component I,catalyst component II, and an activator (e.g., an activator-support and,optionally, an organoaluminum compound), and

wherein a weight-average molecular weight (Mw) of the olefin polymerproduced by the process is at least 10% greater than a weight-averagemolecular weight (Mw) of an olefin polymer obtained under the samepolymerization conditions without catalyst component II.

Catalyst Component I

In polymerization processes of the present invention, the catalystcomposition comprises catalyst component I. Generally, catalystcomponent I comprises a bridged metallocene compound comprising at leastone fluorenyl group, e.g., a fluorenyl group and a cyclopentadienylgroup, a fluorenyl group and an indenyl group, two fluorenyl groups,etc. In some aspects of this invention, catalyst component I cancomprise:

-   -   a compound having formula (C);    -   a compound having formula (D); or    -   any combination thereof.        Formula (C) is

wherein:

M³ is Zr or Hf;

X⁴ and X⁵ are independently F; Cl; Br; I; methyl; benzyl; phenyl; H;BH₄; OBR₂ or SO₃R, wherein R is an alkyl or aryl group having up to 18carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, ora hydrocarbylsilyl group, any of which having up to 18 carbon atoms;

E³ is a bridging group selected from:

-   -   a cyclic or heterocyclic bridging group having up to 18 carbon        atoms,    -   a bridging group having the formula >E^(3A)R^(7A)R^(8A), wherein        E^(3A) is C or Si, and R^(7A) and R^(8A) are independently H or        a hydrocarbyl group having up to 18 carbon atoms,    -   a bridging group having the formula        —CR^(7B)R^(8B)—CR^(7C)R^(8C)—, wherein R^(7B), R^(8B), R^(7C),        and R^(8C) are independently H or a hydrocarbyl group having up        to 10 carbon atoms, or    -   a bridging group having the formula        —SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—, wherein R^(7D), R^(8D), R^(7E),        and R^(8E) are independently H or a hydrocarbyl group having up        to 10 carbon atoms;

R⁹ and R¹⁰ are independently H or a hydrocarbyl group having up to 18carbon atoms; and

Cp¹ is a cyclopentadienyl or indenyl group, any substituent on Cp¹ is Hor a hydrocarbyl or hydrocarbylsilyl group having up to 18 carbon atoms.

Formula (D) is

wherein:

M⁴ is Zr or Hf;

X⁶ and X⁷ are independently F; Cl; Br; I; methyl; benzyl; phenyl; H;BH₄; OBR₂ or SO₃R, wherein R is an alkyl or aryl group having up to 18carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, ora hydrocarbylsilyl group, any of which having up to 18 carbon atoms;

E⁴ is a bridging group selected from:

-   -   a cyclic or heterocyclic bridging group having up to 18 carbon        atoms,    -   a bridging group having the formula >E^(4A)R^(12A)R^(13A),        wherein E^(4A) is C or Si, and R^(12A) and R^(13A) are        independently H or a hydrocarbyl group having up to 18 carbon        atoms,    -   a bridging group having the formula        —CR^(12B)R^(13B)—CR^(12C)R^(13C)—, wherein R^(12B), R^(13B),        R^(12C), and R^(13C) are independently H or a hydrocarbyl group        having up to 10 carbon atoms, or    -   a bridging group having the formula        —SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—, wherein R^(12D), R^(13D),        R^(12E), and R^(13E) are independently H or a hydrocarbyl group        having up to 10 carbon atoms; and

R¹⁴, R¹⁵, R¹⁶, and R¹⁷ are independently H or a hydrocarbyl group havingup to 18 carbon atoms.

Unless otherwise specified, formulas (C) and (D) above, any otherstructural formulas disclosed herein, and any metallocene speciesdisclosed herein are not designed to show stereochemistry or isomericpositioning of the different moieties (e.g., these formulas are notintended to display cis or trans isomers, or R or S diastereoisomers),although such compounds are contemplated and encompassed by theseformulas and/or structures.

Hydrocarbyl is used herein to specify a hydrocarbon radical group thatincludes, but is not limited to, aryl, alkyl, cycloalkyl, alkenyl,cycloalkenyl, cycloalkadienyl, alkynyl, aralkyl, aralkenyl, aralkynyl,and the like, and includes all substituted, unsubstituted, linear,and/or branched derivatives thereof. Unless otherwise specified, thehydrocarbyl groups of this invention typically comprise up to about 18carbon atoms. In another aspect, hydrocarbyl groups can have up to 12carbon atoms, for instance, up to 10 carbon atoms, up to 8 carbon atoms,or up to 6 carbon atoms. A hydrocarbyloxide group, therefore, is usedgenerically to include both alkoxide and aryloxide groups, and thesegroups can comprise up to about 18 carbon atoms. Illustrative andnon-limiting examples of alkoxide and aryloxide groups (i.e.,hydrocarbyloxide groups) include methoxy, ethoxy, propoxy, butoxy,phenoxy, substituted phenoxy, and the like. The term hydrocarbylaminogroup is used generically to refer collectively to alkylamino,arylamino, dialkylamino, and diarylamino groups. Unless otherwisespecified, the hydrocarbylamino groups of this invention comprise up toabout 18 carbon atoms. Hydrocarbylsilyl groups include, but are notlimited to, alkylsilyl groups, alkenylsilyl groups, arylsilyl groups,arylalkylsilyl groups, and the like, which have up to about 18 carbonatoms. For example, illustrative hydrocarbylsilyl groups can includetrimethylsilyl and phenyloctylsilyl. These hydrocarbyloxide,hydrocarbylamino, and hydrocarbylsilyl groups can have up to 12 carbonatoms; alternatively, up to 10 carbon atoms; or alternatively, up to 8carbon atoms, in other aspects of the present invention.

Unless otherwise specified, alkyl groups and alkenyl groups describedherein are intended to include all structural isomers, linear orbranched, of a given moiety; for example, all enantiomers and alldiastereomers are included within this definition. As an example, unlessotherwise specified, the term propyl is meant to include n-propyl andiso-propyl, while the term butyl is meant to include n-butyl, iso-butyl,t-butyl, sec-butyl, and so forth. For instance, non-limiting examples ofoctyl isomers include 2-ethyl hexyl and neooctyl. Suitable examples ofalkyl groups which can be employed in the present invention include, butare not limited to, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl,octyl, nonyl, decyl, and the like. Illustrative examples of alkenylgroups within the scope of the present invention include, but are notlimited to, ethenyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl,octenyl, nonenyl, decenyl, and the like. The alkenyl group can be aterminal alkenyl group, but this is not a requirement. For instance,specific alkenyl group substituents can include, but are not limited to,3-butenyl, 4-pentenyl, 5-hexenyl, 6-heptenyl, 7-octenyl,3-methyl-3-butenyl, 4-methyl-3-pentenyl, 1,1-dimethyl-3-butenyl,1,1-dimethyl-4-pentenyl, and the like.

In this disclosure, aryl is meant to include aryl and arylalkyl groups,and these include, but are not limited to, phenyl, alkyl-substitutedphenyl, naphthyl, alkyl-substituted naphthyl, phenyl-substituted alkyl,naphthyl-substituted alkyl, and the like. Hence, non-limiting examplesof such “aryl” moieties that can be used in the present inventioninclude phenyl, tolyl, benzyl, dimethylphenyl, trimethylphenyl,phenylethyl, phenylpropyl, phenylbutyl, propyl-2-phenylethyl, and thelike. Unless otherwise specified, any substituted aryl moiety usedherein is meant to include all regioisomers; for example, the term tolylis meant to include any possible substituent position, that is, ortho,meta, or para.

In formula (C), M³ is Zr or Hf. X⁴ and X⁵ independently can be F; Cl;Br; I; methyl; benzyl; phenyl; H; BH₄; OBR₂ or SO₃R, wherein R is analkyl or aryl group; or a hydrocarbyloxide group, a hydrocarbylaminogroup, or a hydrocarbylsilyl group. The hydrocarbyloxide group, thehydrocarbylamino group, the hydrocarbylsilyl group and R can have up to18 carbon atoms or, alternatively, up to 12 carbon atoms.

X⁴ and X⁵ independently can be F, Cl, Br, I, benzyl, phenyl, or methyl.For example, X⁴ and X⁵ independently are Cl, benzyl, phenyl, or methylin one aspect of this invention. In another aspect, X⁴ and X⁵independently are benzyl, phenyl, or methyl. Yet, in another aspect,both X⁴ and X⁵ can be Cl; alternatively, both X⁴ and X⁵ can be benzyl;alternatively, both X⁴ and X⁵ can be phenyl; or alternatively, both X⁴and X⁵ can be methyl.

In formula (C), E³ is a bridging group. In accordance with an aspect ofthis invention, E³ can be a cyclic or heterocyclic bridging group havingup to 18 carbon atoms, or alternatively, up to 12 carbon atoms. Cyclicgroups include cycloalkyl and cycloalkenyl moieties and such moietiescan include, but are not limited to, cyclopentyl, cyclopentenyl,cyclohexyl, cyclohexenyl, and the like. For instance, E³ can be acyclopentyl or cyclohexyl moiety. Heteroatom-substituted cyclic groupscan be formed with nitrogen, oxygen, or sulfur heteroatoms. While theseheterocyclic groups can have up to 12 or 18 carbons atoms, theheterocyclic groups can be 3-membered, 4-membered, 5-membered,6-membered, or 7-membered groups in some aspects of this invention.

In accordance with another aspect of this invention, E³ is a bridginggroup having the formula >E^(3A)R^(7A)R^(8A), wherein E^(3A) is C or Si,and R^(7A) and R^(8A) are independently H or a hydrocarbyl group havingup to 18 carbon atoms or, alternatively, up to 12 carbon atoms. Forinstance, R^(7A) and R^(8A) independently can be H or an alkyl, alkenyl(e.g., a terminal alkenyl), or aryl group having up to 12 carbon atoms.Illustrative non-limiting examples of suitable “aryl” moieties forR^(7A) and/or R^(8A) include phenyl, tolyl, benzyl, dimethylphenyl,trimethylphenyl, phenylethyl, phenylpropyl, phenylbutyl,propyl-2-phenylethyl, and the like. In one aspect, R^(7A) and R^(8A) areindependently H, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl,octyl, nonyl, decyl, ethenyl, propenyl, butenyl, pentenyl, hexenyl,heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl, or benzyl. Inanother aspect, R^(7A) and R^(8A) are the same, and are methyl, ethyl,propyl, butyl, pentyl, or phenyl. In yet another aspect, at least one ofR^(7A) and R^(8A) is phenyl. In still another aspect, at least one ofR^(7A) and R^(8A) is a terminal alkenyl group having up to 6 carbonatoms.

In accordance with another aspect of this invention, E³ is a bridginggroup having the formula —CR^(7B)R^(8B)—CR^(7C)R^(8C)—, wherein R^(7B),R^(8B), R^(7C), and R^(8C) are independently H or a hydrocarbyl grouphaving up to 10 carbon atoms or, alternatively, up to 6 carbon atoms.For instance, R^(7B), R^(8B), R^(7C), and R^(8C) independently can be Hor an alkyl or an alkenyl group having up to 6 carbon atoms;alternatively, R^(7B), R^(8B), R^(7C), and R^(8C) independently can beH, methyl, ethyl, propyl, butyl, allyl, butenyl, or pentenyl;alternatively, R^(7B), R^(8B), R^(7C), and R^(8C) independently can beH, methyl, or ethyl; alternatively, R^(7B), R^(8B), R^(7C), and R^(8C)can be H; or alternatively, R^(7B), R^(8B), R^(7C), and R^(8C) can bemethyl.

In accordance with another aspect of this invention, E³ is a bridginggroup having the formula —SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—, whereinR^(7D), R^(8D), R^(7E), and R^(8E) are independently H or a hydrocarbylgroup having up to 10 carbon atoms or, alternatively, up to 6 carbonatoms. Accordingly, in aspects of this invention, R^(7D), R^(8D),R^(7E), and R^(8E) independently can be H or an alkyl or an alkenylgroup having up to 6 carbon atoms; alternatively, R^(7D), R^(8D),R^(7E), and R^(8E) independently can be H, methyl, ethyl, propyl, butyl,allyl, butenyl, or pentenyl; alternatively, R^(7D), R^(8D), R^(7E), andR^(8E) independently can be H, methyl, or ethyl; alternatively, R^(7D),R^(8D), R^(7E), and R^(8E) can be H; or alternatively, R^(7D), R^(8D),R^(7E), and R^(8E) can be methyl.

R⁹ and R¹⁰ on the fluorenyl group in formula (C) are independently H ora hydrocarbyl group having up to 18 carbon atoms or, alternatively,having up to 12 carbon atoms. Accordingly, R⁹ and R¹⁰ independently canbe H or a hydrocarbyl group having up to 8 carbon atoms, such as, forexample, alkyl groups: methyl, ethyl, propyl, butyl, pentyl, or hexyl,and the like. In some aspects, R⁹ and R¹⁰ are independently methyl,ethyl, propyl, n-butyl, t-butyl, or hexyl, while in other aspects, R⁹and R¹⁰ are independently H or t-butyl. For example, both R⁹ and R¹⁰ canbe H or, alternatively, both R⁹ and R¹⁰ can be t-butyl.

In formula (C). Cp¹ is a cyclopentadienyl or indenyl. Often. Cp¹ is acyclopentadienyl group. Any substituent on Cp¹ can be H or a hydrocarbylor hydrocarbylsilyl group having up to 18 carbon atoms; oralternatively, any substituent can be H or a hydrocarbyl orhydrocarbylsilyl group having up to 12 carbon atoms. Possiblesubstituents on Cp¹ may include H, therefore this invention comprisespartially saturated ligands such as tetrahydroindenyl, partiallysaturated indenyl, and the like.

In one aspect, Cp¹ has no additional substitutions other than thoseshown in formula (C), e.g., no substituents other than the bridginggroup E³. In another aspect, Cp¹ can have one or two substituents, andeach substituent independently is H or an alkyl, alkenyl, alkylsilyl, oralkenylsilyl group having up to 8 carbon atoms, or alternatively, up to6 carbon atoms. Yet, in another aspect, Cp¹ can have a single H, methylethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, ethenyl, propenyl,butenyl, pentenyl, hexenyl, heptenyl, or octenyl substituent.

In accordance with one aspect of this invention, X⁴ and X⁵ independentlycan be F, Cl, Br, I, benzyl, phenyl, or methyl, while R⁹ and R¹⁰independently can be 11 or t-butyl, and Cp¹ either has no additionalsubstituents or Cp¹ can have a single substituent selected from H or analkyl, alkenyl, alkylsilyl, or alkenylsilyl group having up to 8 carbonatoms. In these and other aspects, E³ can be cyclopentyl or cyclohexyl;alternatively, E³ can be a bridging group having the formula>E^(3A)R^(7A)R^(8A), wherein E^(3A) is C or Si, and R^(7A) and R^(8A)are independently H, methyl, ethyl, propyl, butyl, pentyl, hexyl,heptyl, octyl, nonyl, decyl, ethenyl, propenyl, butenyl, pentenyl,hexenyl, heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl, or benzyl;alternatively, E³ can be a bridging group having the formula—CR^(7B)R^(8B)—CR^(7C)R^(8C)—, wherein R^(7B), R^(8B), R^(7C), andR^(8C) are independently H or methyl; or alternatively, E³ can be abridging group having the formula —SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—,wherein R^(7D), R^(8D), R^(7E), and R^(8E) are independently H ormethyl.

Non-limiting examples of ansa-metallocene compounds having formula (C)that are suitable for use in catalyst component I include, but are notlimited to, the following (Ph=phenyl; Me=methyl; and t-Bu=tert-butyl):

and the like, or any combination thereof.

In formula (D), M⁴ is Zr or Hf. X⁶ and X⁷ independently can be F; Cl;Br; I; methyl; benzyl; phenyl; Ht; BH₄; OBR₂ or SO₃R, wherein R is analkyl or aryl group; or a hydrocarbyloxide group, a hydrocarbylaminogroup, or a hydrocarbylsilyl group. The hydrocarbyloxide group, thehydrocarbylamino group, the hydrocarbylsilyl group and R can have up to18 carbon atoms or, alternatively, up to 12 carbon atoms.

X⁶ and X⁷ independently can be F, Cl, Br, I, benzyl, phenyl, or methyl.For example, X⁶ and X⁷ independently are Cl, benzyl, phenyl, or methylin one aspect of this invention. In another aspect, X⁶ and X⁷independently are benzyl, phenyl, or methyl. Yet, in another aspect,both X⁶ and X⁷ can be Cl; alternatively, both X⁶ and X⁷ can be benzyl;alternatively, both X⁶ and X⁷ can be phenyl; or alternatively, both X⁶and X⁷ can be methyl.

In formula (D). E⁴ is a bridging group. In accordance with an aspect ofthis invention, E⁴ can be a cyclic or heterocyclic bridging group havingup to 18 carbon atoms, or alternatively, up to 12 carbon atoms. Cyclicgroups include cycloalkyl and cycloalkenyl moieties and such moietiescan include, but are not limited to, cyclopentyl, cyclopentenyl,cyclohexyl, cyclohexenyl, and the like. For instance, E⁴ can be acyclopentyl or cyclohexyl moiety. Heteroatom-substituted cyclic groupscan be formed with nitrogen, oxygen, or sulfur heteroatoms. While theseheterocyclic groups can have up to 12 or 18 carbons atoms, theheterocyclic groups can be 3-membered, 4-membered, 5-membered,6-membered, or 7-membered groups in some aspects of this invention.

In accordance with another aspect of this invention, E⁴ is a bridginggroup having the formula >E^(4A)R^(12A)R^(13A), wherein E^(4A) is C orSi, and R^(12A) and R^(13A) are independently H or a hydrocarbyl grouphaving up to 18 carbon atoms or, alternatively, up to 12 carbon atoms.For instance, R^(12A) and R^(13A) independently can be H or an alkyl,alkenyl (e.g., a terminal alkenyl), or aryl group having up to 12 carbonatoms. Illustrative non-limiting examples of suitable “aryl” moietiesfor R^(12A) and/or R^(13A) include phenyl, tolyl, benzyl,dimethylphenyl, trimethylphenyl, phenylethyl, phenylpropyl, phenylbutyl,propyl-2-phenylethyl, and the like. In one aspect, R^(12A) and R^(13A)independently can be an alkyl, a terminal alkenyl, or aryl group havingup to 10 carbon atoms. In another aspect, R^(12A) and R^(13A) areindependently H, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl,octyl, nonyl, decyl, ethenyl, propenyl, butenyl, pentenyl, hexenyl,heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl, or benzyl. In yetanother aspect, R^(12A) and R^(13A) are the same, and are methyl, ethyl,propyl, butyl, pentyl, or phenyl. In still another aspect, at least oneof R^(12A) and R^(13A) is phenyl and/or at least one of R^(12A) andR^(13A) is a terminal alkenyl group having up to 8 carbon atoms.

In accordance with another aspect of this invention, E⁴ is a bridginggroup having the formula —CR^(12B)R^(13B)—CR^(12C)R^(13C)—, whereinR^(12B), R^(13B), R^(12C), and R^(13C) are independently H or ahydrocarbyl group having up to 10 carbon atoms or, alternatively, up to6 carbon atoms. For instance, R^(12B), R^(13B), R^(2C), and R^(13C)independently can be H or an alkyl or an alkenyl group having up to 6carbon atoms; alternatively, R^(12B), R^(13B), R^(12C), and R^(13C)independently can be H, methyl, ethyl, propyl, butyl, allyl, butenyl, orpentenyl; alternatively, R^(12B), R^(13B), R^(12C) and R^(13C)independently can be H, methyl, ethyl, propyl, or butyl; alternatively,R^(12B), R^(13B), R^(12C), and R^(13C) independently can be H, methyl,or ethyl; alternatively, R^(12B), R^(13B), R^(12C), and R^(13C) can beH; or alternatively, R^(12B), R^(13B), R^(12C), and R^(13C) can bemethyl.

In accordance with another aspect of this invention, E⁴ is a bridginggroup having the formula —SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—, whereinR^(12D), R^(13D), R^(12E), and R^(13E) are independently H or ahydrocarbyl group having up to 10 carbon atoms or, alternatively, up to6 carbon atoms. Accordingly, in aspects of this invention. R^(12D),R^(13D), R^(12E), and R^(13E) independently can be H or an alkyl or analkenyl group having up to 6 carbon atoms; alternatively, R^(12D),R^(13D), R^(12E), and R^(13E) independently can be H, methyl, ethyl,propyl, butyl, allyl, butenyl, or pentenyl; alternatively, R^(12D),R^(13D), R^(12E), and R^(13E) independently can be H, methyl, ethyl,propyl, or butyl; alternatively, R^(12D), R^(13D), R^(12E), and R^(13E)independently can be H, methyl, or ethyl; alternatively, R^(12D),R^(13D), R^(12E), and R^(13E) can be H; or alternatively, R^(12D),R^(13D), R^(12E), and R^(13E) can be methyl.

R¹⁴, R¹⁵, R¹⁶, and R¹⁷ on the fluorenyl groups in formula (D) areindependently H or a hydrocarbyl group having up to 18 carbon atoms or,alternatively, having up to 12 carbon atoms. Accordingly, R¹⁴, R¹⁵, R¹⁶,and R¹⁷ independently can be H or a hydrocarbyl group having up to 8carbon atoms, such as, for example, alkyl groups: methyl, ethyl, propyl,butyl, pentyl, or hexyl, and the like. In some aspects, R¹⁴, R¹⁵, R¹⁶,and R¹⁷ are independently methyl, ethyl, propyl, n-butyl, t-butyl, orhexyl, while in other aspects, R¹⁴, R¹⁵, R¹⁶, and R¹⁷ are independentlyH or t-butyl. For example, R¹⁴, R¹⁵, R¹⁶, and R¹⁷ can be H or,alternatively, R¹⁴, R¹⁵, R¹⁶, and R¹⁷ can be t-butyl.

It is contemplated that X⁶ and X⁷ independently can be F, Cl, Br, I,benzyl, phenyl, or methyl in formula (D), and R¹⁴, R¹⁵, R¹⁶, and R¹⁷independently can be H or t-butyl. In these and other aspects, E⁴ can becyclopentyl or cyclohexyl; alternatively, E⁴ can be a bridging grouphaving the formula >E^(4A)R^(12A)R^(13A), wherein E^(4A) is C or Si, andR^(2A) and R^(13A) are independently H, methyl, ethyl, propyl, butyl,pentyl, hexyl, heptyl, octyl, nonyl, decyl, ethenyl, propenyl, butenyl,pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl,or benzyl; alternatively, E⁴ can be a bridging group having the formula—CR^(12B)R^(13B)—CR^(12C)R^(13C)—, wherein R^(12B), R^(13B), R^(12C),and R^(13C) are independently H or methyl; or alternatively, E⁴ can be abridging group having the formula —SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—,wherein R^(12D), R^(13D), R^(12E), and R^(13E) are independently H ormethyl.

Non-limiting examples of ansa-metallocene compounds having formula (D)that are suitable for use in catalyst component I include, but are notlimited to, the following:

and the like, or any combination thereof.

In accordance with an aspect of this invention, catalyst component I cancomprise a bridged metallocene compound having formula (A). Formula (A)is

wherein:

-   -   M is Zr or Hf;    -   X¹ and X² are independently F, Cl, Br, I, benzyl, phenyl, or        methyl;    -   R¹ and R² are independently H or an alkyl, alkenyl, or aryl        group having up to 12 carbon atoms;    -   R³ and R⁴ are independently H or an alkyl group having up to 12        carbon atoms; and    -   R⁵ is H or an alkyl or alkenyl group having up to 12 carbon        atoms.

In formula (A), M is Zr or Hf, and X¹ and X² independently can be F, Cl,Br, I, benzyl, phenyl, or methyl. For example X¹ and X² independentlyare Cl, benzyl, phenyl, or methyl in one aspect of this invention. Inanother aspect, X¹ and X² independently are benzyl, phenyl, or methyl.Yet, in another aspect, both X¹ and X² can be Cl; alternatively, both X¹and X² can be benzyl; alternatively, both X¹ and X² can be phenyl; oralternatively, both X¹ and X² can methyl.

Substituents R¹ and R² on the carbon bridging atom are independently Hor an alkyl, alkenyl, or aryl group having up to 12 carbon atoms. Forinstance, R¹ and R² independently can be H, methyl, ethyl, propyl,butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, ethenyl, propenyl,butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, phenyl,benzyl, tolyl, or naphthyl, and the like. In accordance with one aspectof the present invention, R¹ and R² are independently methyl, ethyl,propyl, butyl, ethenyl, propenyl, butenyl, pentenyl, hexenyl, benzyl, orphenyl. In another aspect, R¹ and R² are independently H, methyl, ethyl,propyl, butyl, pentyl, hexyl, ethenyl, propenyl, butenyl, pentenyl, orhexenyl. In yet another aspect, R¹ and R² are independently phenyl,benzyl, or tolyl. In still another aspect, R¹ and R² independently areH, methyl, propenyl, butenyl, pentenyl, phenyl, or benzyl.

Substituents on the cyclopentadienyl and fluorenyl groups can include H.On the fluorenyl group, R³ and R⁴ are independently H or an alkyl grouphaving up to 12 carbon atoms. Accordingly, R³ and R⁴ independently canbe H, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl,or decyl, and the like. In some aspects, R³ and R⁴ are independentlymethyl, ethyl, propyl, n-butyl, t-butyl, or hexyl, while in otheraspects, R³ and R⁴ are independently H or t-butyl. For example, both R³and R⁴ can be H or, alternatively, both R³ and R⁴ can be t-butyl.

On the cyclopentadienyl group, R⁵ is H or an alkyl or alkenyl grouphaving up to 12 carbon atoms. R⁵ can be, for instance, H, methyl, ethyl,propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, ethenyl,propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, ordecenyl, and the like. Often, R⁵ is H, methyl, ethyl, propyl, butyl,ethenyl, propenyl, butenyl, pentenyl, or hexenyl. In other aspects, R⁵is H, methyl, ethyl, propyl, butyl, pentyl, or hexyl; or alternatively,R⁵ is ethenyl, propenyl, butenyl, pentenyl, hexenyl, or heptenyl.

In another aspect, at least one of R¹, R², and R⁵ in formula (A) is analkenyl group, such as, for instance, ethenyl, propenyl, butenyl,pentenyl, hexenyl, heptenyl, octenyl, nonenyl, or decenyl, and the like.At least one of R¹, R², and R⁵ can be propenyl, butenyl, pentenyl, orhexenyl in some aspects of this invention.

Nonlimiting examples of suitable bridged metallocene compounds havingformula (A) include the following structures (these compounds areabbreviated as MET-I-A and MET-I-B, respectively, in FIG. 1):

Methods of producing bridged metallocene compounds which can be employedin some aspects of this invention are disclosed in U.S. Pat. Nos.5,498,581, 7,226,886, 7,312,283, 7,456,243, 7,468,452, and 7,517,939,the disclosures of which are incorporated herein by reference in theirentirety.

Catalyst Component II

In polymerization processes of the present invention, the catalystcomposition comprises catalyst component II. Catalyst component II cancomprise:

a compound having the formula

and the like, or any combination thereof.

With the exception of the compound having formula (E), these metallocenecompounds are illustrated in FIG. 1 and are provided with abbreviationsMET-II-A to MET-II-H, respectively. These compounds can be producedusing any suitable method, including those disclosed in U.S. Pat. Nos.7,199,073, 7,226,886, and 7,517,939, the disclosures of which areincorporated herein by reference in their entirety. For instance,MET-II-E can be produced via a zinc reduction of MET-II-F.

In formula (E), M⁵ is Zr or Hf;

X⁸ and X⁹ are independently F; Cl; Br; I; methyl; benzyl; phenyl; H;BH₄; OBR₂ or SO₃R, wherein R is an alkyl or aryl group having up to 18carbon atoms; or a hydrocarbyloxide group, a hydrocarbylamino group, ora hydrocarbylsilyl group, any of which having up to 18 carbon atoms;

Cp² and Cp³ are independently a cyclopentadienyl or indenyl, anysubstituent on Cp² and Cp³ is independently H or a hydrocarbyl grouphaving up to 18 carbon atoms; and

E⁵ is a bridging group having the formula —(CH₂)_(n)—, wherein n is aninteger from 2 to 8, inclusive.

In formula (E), M⁵ can be Zr or Hf, while X⁸ and X⁹ independently can beF; Cl; Br, I; methyl; benzyl; phenyl; H; BH₄; OBR₂ or SO₃R, wherein R isan alkyl or aryl group; or a hydrocarbyloxide group, a hydrocarbylaminogroup, or a hydrocarbylsilyl group. The hydrocarbyloxide group, thehydrocarbylamino group, the hydrocarbylsilyl group and R can have up to18 carbon atoms or, alternatively, up to 12 carbon atoms.

X⁸ and X⁹ independently can be F, Cl, Br, I, benzyl, phenyl, or methyl.For example, X⁸ and X⁹ independently are Cl, benzyl, phenyl, or methylin one aspect of this invention. In another aspect, X⁸ and X⁹independently are benzyl, phenyl, or methyl. Yet, in another aspect,both X⁸ and X⁹ can be Cl; alternatively, both X⁸ and X⁹ can be benzyl;alternatively, both X⁸ and X⁹ can be phenyl; or alternatively, both X⁸and X⁹ can be methyl.

In formula (E), Cp² and Cp³ are independently a cyclopentadienyl or anindenyl group. Often, Cp² and Cp³ are each a cyclopentadienyl group oreach an indenyl group. Any substituent on Cp² and Cp³ independently canbe H or a hydrocarbyl group having up to 18 carbon atoms, oralternatively, any substituent can be H or a hydrocarbyl group having upto 12 carbon atoms. Possible substituents on Cp² and Cp³ may include H,therefore this invention comprises partially saturated ligands such astetrahydroindenyl, partially saturated indenyl, and the like.

In one aspect, Cp² and Cp³ have no substitutions other than those shownin formula (E), e.g., no substituents other than the bridging group E⁵.In another aspect, Cp² and/or Cp³ can have one or two substituents, andeach substituent independently can be H or a hydrocarbyl group having upto 10 carbon atoms, such as, for example, an alkyl, alkenyl, or arylgroup. Yet, in another aspect, Cp² and/or Cp³ can have one or twosubstituents, and each substituent independently can be H, methyl,ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, ethenyl, propenyl,butenyl, pentenyl, hexenyl, heptenyl, octenyl, phenyl, tolyl, or benzyl,while in other aspects, each substituent independently can be methyl,ethyl, propyl, butyl, ethenyl, propenyl, butenyl, or pentenyl.

In formula (E), E⁵ is a bridging group having the formula —(CH₂)_(n)—,wherein n is an integer from 2 to 8, inclusive. The integer n can be 3,4, 5, 6, 7, or 8 in some aspects of this invention; alternatively, n canbe 3, 4, 5, or 6; or alternatively, n can be 3 or 4.

In an aspect of this invention, X⁸ and X⁹ in formula (E) independentlycan be F, Cl, Br, I, benzyl, phenyl, or methyl, and in some aspects, ncan be an integer from 2 to 8, inclusive; or alternatively, n can be 3,4, 5, or 6. Additionally, Cp² and Cp³ can be unsubstitutedcyclopentadienyl groups or unsubstituted indenyl groups (i.e., excludingthe bridging group). Alternatively, Cp² and Cp³ independently may besubstituted with one or two substituents, and these substituentsindependently can be H or a hydrocarbyl group having up to 10 carbonatoms, such as, for example, methyl ethyl, propyl, butyl, pentyl, hexyl,heptyl, octyl, ethenyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl,octenyl, phenyl, tolyl, or benzyl.

Non-limiting examples of metallocene compounds having formula (E) thatare suitable for use in catalyst component II include, but are notlimited to, the following:

and the like, or any combination thereof.

In accordance with one aspect of the present invention, catalystcomponent II comprises MET-II-A, MET-II-B, MET-II-C, MET-II-D, acompound having formula (E), or any combination thereof. In accordancewith another aspect of the present invention, catalyst component IIcomprises MET-II-E, MET-II-F, MET-II-G, MET-II-H, a compound havingformula (E), or any combination thereof. In accordance with yet anotheraspect of the present invention, catalyst component H comprisesMET-II-A. In accordance with still another aspect of the presentinvention, catalyst component II comprises MET-II-B; alternatively,comprises MET-II-C; alternatively, comprises MET-II-D; alternatively,comprises MET-II-E; alternatively, comprises MET-II-F; alternatively,comprises MET-II-G; alternatively, comprises MET-II-H; or alternatively,comprises a compound having formula (E).

Activator-Support

The present invention encompasses various catalyst compositionscontaining an activator, which can be an activator-support. In oneaspect, the activator-support comprises a chemically-treated solidoxide. Alternatively, the activator-support can comprise a clay mineral,a pillared clay, an exfoliated clay, an exfoliated clay gelled intoanother oxide matrix, a layered silicate mineral, a non-layered silicatemineral, a layered aluminosilicate mineral, a non-layeredaluminosilicate mineral, or any combination thereof.

Generally, chemically-treated solid oxides exhibit enhanced acidity ascompared to the corresponding untreated solid oxide compound. Thechemically-treated solid oxide also functions as a catalyst activator ascompared to the corresponding untreated solid oxide. While thechemically-treated solid oxide activates the metallocene in the absenceof co-catalysts, it is not necessary to eliminate co-catalysts from thecatalyst composition. The activation function of the activator-supportis evident in the enhanced activity of catalyst composition as a whole,as compared to a catalyst composition containing the correspondinguntreated solid oxide. However, it is believed that thechemically-treated solid oxide can function as an activator, even in theabsence of an organoaluminum compound, aluminoxanes, organoboron ororganoborate compounds, ionizing ionic compounds, and the like.

The chemically-treated solid oxide can comprise a solid oxide treatedwith an electron-withdrawing anion. While not intending to be bound bythe following statement, it is believed that treatment of the solidoxide with an electron-withdrawing component augments or enhances theacidity of the oxide. Thus, either the activator-support exhibits Lewisor Brønsted acidity that is typically greater than the Lewis or Brønstedacid strength of the untreated solid oxide, or the activator-support hasa greater number of acid sites than the untreated solid oxide, or both.One method to quantify the acidity of the chemically-treated anduntreated solid oxide materials is by comparing the polymerizationactivities of the treated and untreated oxides under acid catalyzedreactions.

Chemically-treated solid oxides of this invention are formed generallyfrom an inorganic solid oxide that exhibits Lewis acidic or Brønstedacidic behavior and has a relatively high porosity. The solid oxide ischemically-treated with an electron-withdrawing component, typically anelectron-withdrawing anion, to form an activator-support.

According to one aspect of the present invention, the solid oxide usedto prepare the chemically-treated solid oxide has a pore volume greaterthan about 0.1 cc/g. According to another aspect of the presentinvention, the solid oxide has a pore volume greater than about 0.5cc/g. According to yet another aspect of the present invention, thesolid oxide has a pore volume greater than about 1.0 cc/g.

In another aspect, the solid oxide has a surface area of from about 100to about 1000 m²/g. In yet another aspect, the solid oxide has a surfacearea of from about 200 to about 800 m²/g. In still another aspect of thepresent invention, the solid oxide has a surface area of from about 250to about 600 m²/g.

The chemically-treated solid oxide can comprise a solid inorganic oxidecomprising oxygen and one or more elements selected from Group 2, 3, 4,5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 of the periodic table, orcomprising oxygen and one or more elements selected from the lanthanideor actinide elements (See: Hawley's Condensed Chemical Dictionary,11^(th) Ed., John Wiley & Sons, 1995; Cotton. F. A., Wilkinson, G.,Murillo, C. A., and Bochmann, M., Advanced Inorganic Chenmistry, 6^(th)Ed., Wiley-Interscience, 1999). For example, the inorganic oxide cancomprise oxygen and an element, or elements, selected from Al, B, Be,Bi, Cd, Co, Cr, Cu, Fe, Ga, La, Mn, Mo, Ni, Sb, Si, Sn, Sr, Th, Ti, V,W, P, Y, Zn, and Zr.

Suitable examples of solid oxide materials or compounds that can be usedto form the chemically-treated solid oxide include, but are not limitedto, Al₂O₃, B₂O₃, BeO, Bi₂O₃, CdO, Co₃O₄, Cr₂O₃, CuO, Fe₂O₃, Ga₂O₃,La₂O₃, Mn₂O₃, MoO₃, NiO, P₂O, Sb₂O, SiO₂, SnO₂, SrO, ThO₂, TiO₂, V₂O₅,WO₃, Y₂O₃, ZnO, ZrO₂, and the like, including mixed oxides thereof, andcombinations thereof. For example, the solid oxide can comprise silica,alumina, silica-alumina, aluminum phosphate, aluminophosphate,heteropolytungstate, titania, zirconia, magnesia, boria, zinc oxide,mixed oxides thereof, or any combination thereof.

The solid oxide of this invention encompasses oxide materials such asalumina, “mixed oxide” compounds thereof such as silica-alumina, andcombinations and mixtures thereof. The mixed oxide compounds such assilica-alumina can be single or multiple chemical phases with more thanone metal combined with oxygen to form a solid oxide compound. Examplesof mixed oxides that can be used in the activator-support of the presentinvention include, but are not limited to, silica-alumina,silica-titania, silica-zirconia, zeolites, various clay minerals,alumina-titania, alumina-zirconia, zinc-aluminate, alumina-boria,silica-boria, aluminophosphate-silica, titania-zirconia, and the like.The solid oxide of this invention also encompasses oxide materials suchas silica-coated alumina, as described in U.S. Patent Publication No.2010-0076167, the disclosure of which is incorporated herein byreference in its entirety.

The electron-withdrawing component used to treat the solid oxide can beany component that increases the Lewis or Brønsted acidity of the solidoxide upon treatment (as compared to the solid oxide that is not treatedwith at least one electron-withdrawing anion). According to one aspectof the present invention, the electron-withdrawing component is anelectron-withdrawing anion derived from a salt, an acid, or othercompound, such as a volatile organic compound, that serves as a sourceor precursor for that anion. Examples of electron-withdrawing anionsinclude, but are not limited to, sulfate, bisulfate, fluoride, chloride,bromide, iodide, fluorosulfate, fluoroborate, phosphate,fluorophosphate, trifluoroacetate, triflate, fluorozirconate,fluorotitanate, phospho-tungstate, and the like, including mixtures andcombinations thereof. In addition, other ionic or non-ionic compoundsthat serve as sources for these electron-withdrawing anions also can beemployed in the present invention. It is contemplated that theelectron-withdrawing anion can be, or can comprise, fluoride, chloride,bromide, phosphate, triflate, bisulfate, or sulfate, and the like, orany combination thereof, in some aspects of this invention. In otheraspects, the electron-withdrawing anion can comprise sulfate, bisulfate,fluoride, chloride, bromide, iodide, fluorosulfate, fluoroborate,phosphate, fluorophosphate, trifluoroacetate, triflate, fluorozirconate,fluorotitanate, and the like, or any combination thereof.

Thus, for example, the activator-support (e.g., chemically-treated solidoxide) used in the catalyst compositions of the present invention canbe, or can comprise, fluorided alumina, chlorided alumina, bromidedalumina, sulfated alumina, fluorided silica-alumina, chloridedsilica-alumina, bromided silica-alumina, sulfated silica-alumina,fluorided silica-zirconia, chlorided silica-zirconia, bromidedsilica-zirconia, sulfated silica-zirconia, fluorided silica-titania,fluorided silica-coated alumina, sulfated silica-coated alumina,phosphated silica-coated alumina, and the like, or combinations thereof.In some aspects, the activator-support comprises fluorided alumina;alternatively, comprises chlorided alumina; alternatively, comprisessulfated alumina; alternatively, comprises fluorided silica-alumina;alternatively, comprises sulfated silica-alumina; alternatively,comprises fluorided silica-zirconia; alternatively, comprises chloridedsilica-zirconia; or alternatively, comprises fluorided silica-coatedalumina.

When the electron-withdrawing component comprises a salt of anelectron-withdrawing anion, the counterion or cation of that salt can beselected from any cation that allows the salt to revert or decomposeback to the acid during calcining. Factors that dictate the suitabilityof the particular salt to serve as a source for the electron-withdrawinganion include, but are not limited to, the solubility of the salt in thedesired solvent, the lack of adverse reactivity of the cation,ion-pairing effects between the cation and anion, hygroscopic propertiesimparted to the salt by the cation, and the like, and thermal stabilityof the anion. Examples of suitable cations in the salt of theelectron-withdrawing anion include, but are not limited to, ammonium,trialkyl ammonium, tetraalkyl ammonium, tetraalkyl phosphonium, H⁺,[H(OEt₂)₂]⁺, and the like.

Further, combinations of one or more different electron-withdrawinganions, in varying proportions, can be used to tailor the specificacidity of the activator-support to the desired level. Combinations ofelectron-withdrawing components can be contacted with the oxide materialsimultaneously or individually, and in any order that affords thedesired chemically-treated solid oxide acidity. For example, one aspectof this invention is employing two or more electron-withdrawing anionsource compounds in two or more separate contacting steps.

Thus, one example of such a process by which a chemically-treated solidoxide is prepared is as follows: a selected solid oxide, or combinationof solid oxides, is contacted with a first electron-withdrawing anionsource compound to form a first mixture; this first mixture is calcinedand then contacted with a second electron-withdrawing anion sourcecompound to form a second mixture; the second mixture is then calcinedto form a treated solid oxide. In such a process, the first and secondelectron-withdrawing anion source compounds can be either the same ordifferent compounds.

According to another aspect of the present invention, thechemically-treated solid oxide comprises a solid inorganic oxidematerial, a mixed oxide material, or a combination of inorganic oxidematerials, that is chemically-treated with an electron-withdrawingcomponent, and optionally treated with a metal source, including metalsalts, metal ions, or other metal-containing compounds. Non-limitingexamples of the metal or metal ion include zinc, nickel, vanadium,titanium, silver, copper, gallium, tin, tungsten, molybdenum, zirconium,and the like, or combinations thereof. Examples of chemically-treatedsolid oxides that contain a metal or metal ion include, but are notlimited to, chlorided zinc-impregnated alumina, fluoridedtitanium-impregnated alumina, fluorided zinc-impregnated alumina,chlorided zinc-impregnated silica-alumina, fluorided zinc-impregnatedsilica-alumina, sulfated zinc-impregnated alumina, chlorided zincaluminate, fluorided zinc aluminate, sulfated zinc aluminate,silica-coated alumina treated with hexafluorotitanic acid, silica-coatedalumina treated with zinc and then fluorided, and the like, or anycombination thereof.

Any method of impregnating the solid oxide material with a metal can beused. The method by which the oxide is contacted with a metal source,typically a salt or metal-containing compound, can include, but is notlimited to, gelling, co-gelling, impregnation of one compound ontoanother, and the like. If desired, the metal-containing compound isadded to or impregnated into the solid oxide in solution form, andsubsequently converted into the supported metal upon calcining.Accordingly, the solid inorganic oxide can further comprise a metalselected from zinc, titanium, nickel, vanadium, silver, copper, gallium,tin, tungsten, molybdenum, and the like, or combinations of thesemetals. For example, zinc is often used to impregnate the solid oxidebecause it can provide improved catalyst activity at a low cost.

The solid oxide can be treated with metal salts or metal-containingcompounds before, after, or at the same time that the solid oxide istreated with the electron-withdrawing anion. Following any contactingmethod, the contacted mixture of solid compound, electron-withdrawinganion, and the metal ion is typically calcined. Alternatively, a solidoxide material, an electron-withdrawing anion source, and the metal saltor metal-containing compound are contacted and calcined simultaneously.

Various processes are used to form the chemically-treated solid oxideuseful in the present invention. The chemically-treated solid oxide cancomprise the contact product of one or more solid oxides with one ormore electron-withdrawing anion sources. It is not required that thesolid oxide be calcined prior to contacting the electron-withdrawinganion source. The contact product typically is calcined either during orafter the solid oxide is contacted with the electron-withdrawing anionsource. The solid oxide can be calcined or uncalcined. Various processesto prepare solid oxide activator-supports that can be employed in thisinvention have been reported. For example, such methods are described inU.S. Pat. Nos. 6,107,230, 6,165,929, 6,294,494, 6,300,271, 6,316,553,6,355,594, 6,376,415, 6,388,017, 6,391,816, 6,395,666, 6,524,987,6,548,441, 6,548,442, 6,576,583, 6,613,712, 6,632,894, 6,667,274, and6,750,302, the disclosures of which are incorporated herein by referencein their entirety.

According to one aspect of the present invention, the solid oxidematerial is chemically-treated by contacting it with anelectron-withdrawing component, typically an electron-withdrawing anionsource. Further, the solid oxide material optionally is chemicallytreated with a metal ion, and then calcined to form a metal-containingor metal-impregnated chemically-treated solid oxide. According toanother aspect of the present invention, the solid oxide material andelectron-withdrawing anion source are contacted and calcinedsimultaneously.

The method by which the oxide is contacted with the electron-withdrawingcomponent, typically a salt or an acid of an electron-withdrawing anion,can include, but is not limited to, gelling, co-gelling, impregnation ofone compound onto another, and the like. Thus, following any contactingmethod, the contacted mixture of the solid oxide, electron-withdrawinganion, and optional metal ion, is calcined.

The solid oxide activator-support (i.e., chemically-treated solid oxide)thus can be produced by a process comprising:

1) contacting a solid oxide (or solid oxides) with anelectron-withdrawing anion source compound (or compounds) to form afirst mixture; and

2) calcining the first mixture to form the solid oxideactivator-support.

According to another aspect of the present invention, the solid oxideactivator-support (chemically-treated solid oxide) is produced by aprocess comprising:

1) contacting a solid oxide (or solid oxides) with a firstelectron-withdrawing anion source compound to form a first mixture;

2) calcining the first mixture to produce a calcined first mixture;

3) contacting the calcined first mixture with a secondelectron-withdrawing anion source compound to form a second mixture; and

4) calcining the second mixture to form the solid oxideactivator-support.

According to yet another aspect of the present invention, thechemically-treated solid oxide is produced or formed by contacting thesolid oxide with the electron-withdrawing anion source compound, wherethe solid oxide compound is calcined before, during, or after contactingthe electron-withdrawing anion source, and where there is a substantialabsence of aluminoxanes, organoboron or organoborate compounds, andionizing ionic compounds.

Calcining of the treated solid oxide generally is conducted in anambient atmosphere, typically in a dry ambient atmosphere, at atemperature from about 200° C. to about 900° C. and for a time of about1 minute to about 100 hours. Calcining can be conducted at a temperatureof from about 300° C. to about 800° C., or alternatively, at atemperature of from about 400° C. to about 700° C. Calcining can beconducted for about 30 minutes to about 50 hours, or for about 1 hour toabout 15 hours. Thus, for example, calcining can be carried out forabout 1 to about 10 hours at a temperature of from about 350° C. toabout 550° C. Any suitable ambient atmosphere can be employed duringcalcining. Generally, calcining is conducted in an oxidizing atmosphere,such as air. Alternatively, an inert atmosphere, such as nitrogen orargon, or a reducing atmosphere, such as hydrogen or carbon monoxide,can be used.

According to one aspect of the present invention, the solid oxidematerial is treated with a source of halide ion, sulfate ion, or acombination of anions, optionally treated with a metal ion, and thencalcined to provide the chemically-treated solid oxide in the form of aparticulate solid. For example, the solid oxide material can be treatedwith a source of sulfate (termed a “sulfating agent”), a source ofchloride ion (termed a “chloriding agent”), a source of fluoride ion(termed a “fluoriding agent”), or a combination thereof, and calcined toprovide the solid oxide activator. Useful acidic activator-supportsinclude, but are not limited to, bromided alumina, chlorided alumina,fluorided alumina, sulfated alumina, bromided silica-alumina, chloridedsilica-alumina, fluorided silica-alumina, sulfated silica-alumina,bromided silica-zirconia, chlorided silica-zirconia, fluoridedsilica-zirconia, sulfated silica-zirconia, fluorided silica-titania,alumina treated with hexafluorotitanic acid, silica-coated aluminatreated with hexafluorotitanic acid, silica-alumina treated withhexafluorozirconic acid, silica-alumina treated with trifluoroaceticacid, fluorided boria-alumina, silica treated with tetrafluoroboricacid, alumina treated with tetrafluoroboric acid, alumina treated withhexafluorophosphoric acid, a pillared clay, such as a pillaredmontmorillonite, optionally treated with fluoride, chloride, or sulfate;phosphated alumina or other aluminophosphates optionally treated withsulfate, fluoride, or chloride; or any combination of the above.Further, any of these activator-supports optionally can be treated witha metal ion.

The chemically-treated solid oxide can comprise a fluorided solid oxidein the form of a particulate solid. The fluorided solid oxide can beformed by contacting a solid oxide with a fluoriding agent. The fluorideion can be added to the oxide by forming a slurry of the oxide in asuitable solvent such as alcohol or water including, but not limited to,the one to three carbon alcohols because of their volatility and lowsurface tension. Examples of suitable fluoriding agents include, but arenot limited to, hydrofluoric acid (HF), ammonium fluoride (NH₄F),ammonium bifluoride (NH₄HF₂), ammonium tetrafluoroborate (NH₄BF₄),ammonium silicofluoride (hexafluorosilicate) ((NH₄)₂SiF₆), ammoniumhexafluorophosphate (NH₄PF₆), hexafluorotitanic acid (H₂TiF₆), ammoniumhexafluorotitanic acid ((NH₄)₂TiF₆), hexafluorozirconic acid (H₂ZrF₆),AlF₃, NH₄AlF₄, analogs thereof, and combinations thereof. Triflic acidand ammonium triflate also can be employed. For example, ammoniumbifluoride (NH₄HF₂) can be used as the fluoriding agent, due to its easeof use and availability.

If desired, the solid oxide is treated with a fluoriding agent duringthe calcining step. Any fluoriding agent capable of thoroughlycontacting the solid oxide during the calcining step can be used. Forexample, in addition to those fluoriding agents described previously,volatile organic fluoriding agents can be used. Examples of volatileorganic fluoriding agents useful in this aspect of the inventioninclude, but are not limited to, freons, perfluorohexane,perfluorobenzene, fluoromethane, trifluoroethanol, and the like, andcombinations thereof. Calcining temperatures generally must be highenough to decompose the compound and release fluoride. Gaseous hydrogenfluoride (HF) or fluorine (F₂) itself also can be used with the solidoxide if fluorided while calcining. Silicon tetrafluoride (SiF₄) andcompounds containing tetrafluoroborate (BF₄ ⁻) also can be employed. Oneconvenient method of contacting the solid oxide with the fluoridingagent is to vaporize a fluoriding agent into a gas stream used tofluidize the solid oxide during calcination.

Similarly, in another aspect of this invention, the chemically-treatedsolid oxide comprises a chlorided solid oxide in the form of aparticulate solid. The chlorided solid oxide is formed by contacting asolid oxide with a chloriding agent. The chloride ion can be added tothe oxide by forming a slurry of the oxide in a suitable solvent. Thesolid oxide can be treated with a chloriding agent during the calciningstep. Any chloriding agent capable of serving as a source of chlorideand thoroughly contacting the oxide during the calcining step can beused, such as SiCl₄, SiMe₂Cl₂, TiCl₄, BCl₃, and the like, includingmixtures thereof. Volatile organic chloriding agents can be used.Examples of suitable volatile organic chloriding agents include, but arenot limited to, certain freons, perchlorobenzene, chloromethane,dichloromethane, chloroform, carbon tetrachloride, trichloroethanol, andthe like, or any combination thereof. Gaseous hydrogen chloride orchlorine itself also can be used with the solid oxide during calcining.One convenient method of contacting the oxide with the chloriding agentis to vaporize a chloriding agent into a gas stream used to fluidize thesolid oxide during calcination.

The amount of fluoride or chloride ion present before calcining thesolid oxide generally is from about 1 to about 50% by weight, where theweight percent is based on the weight of the solid oxide, for example,silica-alumina, before calcining. According to another aspect of thisinvention, the amount of fluoride or chloride ion present beforecalcining the solid oxide is from about 1 to about 25% by weight, andaccording to another aspect of this invention, from about 2 to about 20%by weight. According to yet another aspect of this invention, the amountof fluoride or chloride ion present before calcining the solid oxide isfrom about 4 to about 10% by weight. Once impregnated with halide, thehalided oxide can be dried by any suitable method including, but notlimited to, suction filtration followed by evaporation, drying undervacuum, spray drying, and the like, although it is also possible toinitiate the calcining step immediately without drying the impregnatedsolid oxide.

The silica-alumina used to prepare the treated silica-alumina typicallyhas a pore volume greater than about 0.5 cc/g. According to one aspectof the present invention, the pore volume is greater than about 0.8cc/g, and according to another aspect of the present invention, greaterthan about 1.0 cc/g. Further, the silica-alumina generally has a surfacearea greater than about 100 m²/g. According to another aspect of thisinvention, the surface area is greater than about 250 m²/g. Yet, inanother aspect, the surface area is greater than about 350 m²/g.

The silica-alumina utilized in the present invention typically has analumina content from about 5 to about 95% by weight. According to oneaspect of this invention, the alumina content of the silica-alumina isfrom about 5 to about 50%, or from about 8% to about 30%, alumina byweight. In another aspect, high alumina content silica-alumina compoundscan employed, in which the alumina content of these silica-aluminacompounds typically ranges from about 60% to about 90%, or from about65% to about 80%, alumina by weight. According to yet another aspect ofthis invention, the solid oxide component comprises alumina withoutsilica, and according to another aspect of this invention, the solidoxide component comprises silica without alumina.

The sulfated solid oxide comprises sulfate and a solid oxide component,such as alumina or silica-alumina, in the form of a particulate solid.Optionally, the sulfated oxide is treated further with a metal ion suchthat the calcined sulfated oxide comprises a metal. According to oneaspect of the present invention, the sulfated solid oxide comprisessulfate and alumina. In some instances, the sulfated alumina is formedby a process wherein the alumina is treated with a sulfate source, forexample, sulfuric acid or a sulfate salt such as ammonium sulfate. Thisprocess is generally performed by forming a slurry of the alumina in asuitable solvent, such as alcohol or water, in which the desiredconcentration of the sulfating agent has been added. Suitable organicsolvents include, but are not limited to, the one to three carbonalcohols because of their volatility and low surface tension.

According to one aspect of this invention, the amount of sulfate ionpresent before calcining is from about 0.5 to about 100 parts by weightsulfate ion to about 100 parts by weight solid oxide. According toanother aspect of this invention, the amount of sulfate ion presentbefore calcining is from about 1 to about 50 parts by weight sulfate ionto about 100 parts by weight solid oxide, and according to still anotheraspect of this invention, from about 5 to about 30 parts by weightsulfate ion to about 100 parts by weight solid oxide. These weightratios are based on the weight of the solid oxide before calcining. Onceimpregnated with sulfate, the sulfated oxide can be dried by anysuitable method including, but not limited to, suction filtrationfollowed by evaporation, drying under vacuum, spray drying, and thelike, although it is also possible to initiate the calcining stepimmediately.

According to another aspect of the present invention, theactivator-support used in preparing the catalyst compositions of thisinvention comprises an ion-exchangeable activator-support, including butnot limited to silicate and aluminosilicate compounds or minerals,either with layered or non-layered structures, and combinations thereof.In another aspect of this invention, ion-exchangeable, layeredaluminosilicates such as pillared clays are used as activator-supports.When the acidic activator-support comprises an ion-exchangeableactivator-support, it can optionally be treated with at least oneelectron-withdrawing anion such as those disclosed herein, thoughtypically the ion-exchangeable activator-support is not treated with anelectron-withdrawing anion.

According to another aspect of the present invention, theactivator-support of this invention comprises clay minerals havingexchangeable cations and layers capable of expanding. Typical claymineral activator-supports include, but are not limited to,ion-exchangeable, layered aluminosilicates such as pillared clays.Although the term “support” is used, it is not meant to be construed asan inert component of the catalyst composition, but rather is to beconsidered an active part of the catalyst composition, because of itsintimate association with the metallocene component.

According to another aspect of the present invention, the clay materialsof this invention encompass materials either in their natural state orthat have been treated with various ions by wetting, ion exchange, orpillaring. Typically, the clay material activator-support of thisinvention comprises clays that have been ion exchanged with largecations, including polynuclear, highly charged metal complex cations.However, the clay material activator-supports of this invention alsoencompass clays that have been ion exchanged with simple salts,including, but not limited to, salts of Al(III), Fe(II), Fe(III), andZn(II) with ligands such as halide, acetate, sulfate, nitrate, ornitrite.

According to another aspect of the present invention, theactivator-support comprises a pillared clay. The term “pillared clay” isused to refer to clay materials that have been ion exchanged with large,typically polynuclear, highly charged metal complex cations. Examples ofsuch ions include, but are not limited to, Keggin ions which can havecharges such as 7+, various polyoxometallates, and other large ions.Thus, the term pillaring refers to a simple exchange reaction in whichthe exchangeable cations of a clay material are replaced with large,highly charged ions, such as Keggin ions. These polymeric cations arethen immobilized within the interlayers of the clay and when calcinedare converted to metal oxide “pillars,” effectively supporting the claylayers as column-like structures. Thus, once the clay is dried andcalcined to produce the supporting pillars between clay layers, theexpanded lattice structure is maintained and the porosity is enhanced.The resulting pores can vary in shape and size as a function of thepillaring material and the parent clay material used. Examples ofpillaring and pillared clays are found in: T. J. Pinnavaia, Science 220(4595), 365-371 (1983); J. M. Thomas, Intercalation Chemistry, (S.Whittington and A. Jacobson, eds.) Ch. 3, pp. 55-99, Academic Press,Inc., (1972); U.S. Pat. Nos. 4,452,910; 5,376,611; and 4,060,480; thedisclosures of which are incorporated herein by reference in theirentirety.

The pillaring process utilizes clay minerals having exchangeable cationsand layers capable of expanding. Any pillared clay that can enhance thepolymerization of olefins in the catalyst composition of the presentinvention can be used. Therefore, suitable clay minerals for pillaringinclude, but are not limited to, allophanes; smectites, bothdioctahedral (Al) and tri-octahedral (Mg) and derivatives thereof suchas montmorillonites (bentonites), nontronites, hectorites, or laponites;halloysites; vermiculites; micas; fluoromicas; chlorites; mixed-layerclays; the fibrous clays including but not limited to sepiolites,attapulgites, and palygorskites; a serpentine clay; illite; laponite;saponite; and any combination thereof. In one aspect, the pillared clayactivator-support comprises bentonite or montmorillonite. The principalcomponent of bentonite is montmorillonite.

The pillared clay can be pretreated if desired. For example, a pillaredbentonite is pretreated by drying at about 300° C. under an inertatmosphere, typically dry nitrogen, for about 3 hours, before beingadded to the polymerization reactor. Although an exemplary pretreatmentis described herein, it should be understood that the preheating can becarried out at many other temperatures and times, including anycombination of temperature and time steps, all of which are encompassedby this invention.

The activator-support used to prepare the catalyst compositions of thepresent invention can be combined with other inorganic supportmaterials, including, but not limited to, zeolites, inorganic oxides,phosphated inorganic oxides, and the like. In one aspect, typicalsupport materials that are used include, but are not limited to, silica,silica-alumina, alumina, titania, zirconia, magnesia, boria, thoria,aluminophosphate, aluminum phosphate, silica-titania, coprecipitatedsilica/titania, mixtures thereof, or any combination thereof.

According to another aspect of the present invention, one or more of themetallocene compounds can be precontacted with an olefin monomer and anorganoaluminum compound for a first period of time prior to contactingthis mixture with the activator-support. Once the precontacted mixtureof the metallocene compound(s), olefin monomer, and organoaluminumcompound is contacted with the activator-support, the compositionfurther comprising the activator-support is termed a “postcontacted”mixture. The postcontacted mixture can be allowed to remain in furthercontact for a second period of time prior to being charged into thereactor in which the polymerization process will be carried out.

According to yet another aspect of the present invention, one or more ofthe metallocene compounds can be precontacted with an olefin monomer andan activator-support for a first period of time prior to contacting thismixture with the organoaluminum compound. Once the precontacted mixtureof the metallocene compound(s), olefin monomer, and activator-support iscontacted with the organoaluminum compound, the composition furthercomprising the organoaluminum is termed a “postcontacted” mixture. Thepostcontacted mixture can be allowed to remain in further contact for asecond period of time prior to being introduced into the polymerizationreactor.

Organoaluminum Compounds

In some aspects, catalyst compositions of the present invention cancomprise one or more organoaluminum compounds. Such compounds caninclude, but are not limited to, compounds having the formula:(R^(C))₃Al;where R^(C) is an aliphatic group having from 1 to 10 carbon atoms. Forexample, R^(C) can be methyl, ethyl, propyl, butyl, hexyl, or isobutyl.

Other organoaluminum compounds which can be used in catalystcompositions disclosed herein can include, but are not limited to,compounds having the formula:Al(X^(A))_(m)(X^(B))_(3-m),where X^(A) is a hydrocarbyl; X^(B) is an alkoxide or an aryloxide, ahalide, or a hydride; and in is from 1 to 3, inclusive. Hydrocarbyl isused herein to specify a hydrocarbon radical group and includes, but isnot limited to, aryl, alkyl, cycloalkyl, alkenyl, cycloalkenyl,cycloalkadienyl, alkynyl, aralkyl, aralkenyl, aralkynyl, and the like,and includes all substituted, unsubstituted, branched, linear, and/orheteroatom substituted derivatives thereof.

In one aspect, X^(A) is a hydrocarbyl having from 1 to about 18 carbonatoms. In another aspect of the present invention, X^(A) is an alkylhaving from 1 to 10 carbon atoms. For example, X^(A) can be methyl,ethyl, propyl, n-butyl, sec-butyl, isobutyl, or hexyl, and the like, inyet another aspect of the present invention.

According to one aspect of the present invention, X^(B) is an alkoxideor an aryloxide, any one of which has from 1 to 18 carbon atoms, ahalide, or a hydride. In another aspect of the present invention, X^(B)is selected independently from fluorine and chlorine. Yet, in anotheraspect, X^(B) is chlorine.

In the formula, Al(X^(A))_(m)(X^(B))_(3-m), m is a number from 1 to 3,inclusive, and typically, m is 3. The value of m is not restricted to bean integer; therefore, this formula includes sesquihalide compounds orother organoaluminum cluster compounds.

Examples of organoaluminum compounds suitable for use in accordance withthe present invention include, but are not limited to, trialkylaluminumcompounds, dialkylaluminum halide compounds, dialkylaluminum alkoxidecompounds, dialkylaluminum hydride compounds, and combinations thereof.Specific non-limiting examples of suitable organoaluminum compoundsinclude trimethylaluminum (TMA), triethylaluminum (TEA),tri-n-propylaluminum (TNPA), tri-n-butylaluminum (TNBA),triisobutylaluminum (TIBA), tri-n-hexylaluminum, tri-n-octylaluminum,diisobutylaluminum hydride, diethylaluminum ethoxide, diethylaluminumchloride, and the like, or combinations thereof. In some aspects, theorganoaluminum compound comprises TMA, TEA, TNPA, TNBA, TIBA,tri-n-hexylaluminum, tri-n-octylaluminum, or a combination thereof;alternatively, comprises TMA; alternatively, comprises TEA;alternatively, comprises TNPA; alternatively, comprises TNBA;alternatively, comprises TIBA; alternatively, comprisestri-n-hexylaluminum; or alternatively, comprises tri-n-octylaluminum.

The present invention contemplates a method of precontacting ametallocene compound with an organoaluminum compound and an olefinmonomer to form a precontacted mixture, prior to contacting thisprecontacted mixture with an activator-support to form a catalystcomposition. When the catalyst composition is prepared in this manner,typically, though not necessarily, a portion of the organoaluminumcompound is added to the precontacted mixture and another portion of theorganoaluminum compound is added to the postcontacted mixture preparedwhen the precontacted mixture is contacted with the solid oxideactivator-support. However, the entire organoaluminum compound can beused to prepare the catalyst composition in either the precontacting orpostcontacting step. Alternatively, all the catalyst components arecontacted in a single step.

Further, more than one organoaluminum compound can be used in either theprecontacting or the postcontacting step. When an organoaluminumcompound is added in multiple steps, the amounts of organoaluminumcompound disclosed herein include the total amount of organoaluminumcompound used in both the precontacted and postcontacted mixtures, andany additional organoaluminum compound added to the polymerizationreactor. Therefore, total amounts of organoaluminum compounds aredisclosed regardless of whether a single organoaluminum compound or morethan one organoaluminum compound is used.

Aluminoxane Compounds

The present invention further provides a catalyst composition which cancomprise an aluminoxane compound. As used herein, the term “aluminoxane”refers to aluminoxane compounds, compositions, mixtures, or discretespecies, regardless of how such aluminoxanes are prepared, formed orotherwise provided. For example, a catalyst composition comprising analuminoxane compound can be prepared in which aluminoxane is provided asthe poly(hydrocarbyl aluminum oxide), or in which aluminoxane isprovided as the combination of an aluminum alkyl compound and a sourceof active protons such as water. Aluminoxanes are also referred to aspoly(hydrocarbyl aluminum oxides) or organoaluminoxanes.

The other catalyst components typically are contacted with thealuminoxane in a saturated hydrocarbon compound solvent, though anysolvent that is substantially inert to the reactants, intermediates, andproducts of the activation step can be used. The catalyst compositionformed in this manner is collected by any suitable method, for example,by filtration. Alternatively, the catalyst composition is introducedinto the polymerization reactor without being isolated.

The aluminoxane compound of this invention can be an oligomeric aluminumcompound comprising linear structures, cyclic structures, or cagestructures, or mixtures of all three. Cyclic aluminoxane compoundshaving the formula:

wherein R in this formula is a linear or branched alkyl having from 1 to10 carbon atoms, and p is an integer from 3 to 20, are encompassed bythis invention. The AlRO moiety shown here also constitutes therepeating unit in a linear aluminoxane. Thus, linear aluminoxanes havingthe formula:

wherein R in this formula is a linear or branched alkyl having from 1 to10 carbon atoms, and q is an integer from 1 to 50, are also encompassedby this invention.

Further, aluminoxanes can have cage structures of the formula R^(t)_(5r+α)R^(b) _(r−α)Al_(4r)O_(3r), wherein R^(t) is a terminal linear orbranched alkyl group having from 1 to 10 carbon atoms; R^(b) is abridging linear or branched alkyl group having from 1 to 10 carbonatoms; r is 3 or 4; and α is equal to n_(Al(3))−n_(O(2))+n_(O(4))),wherein n_(Al(3)) is the number of three coordinate aluminum atoms,n_(O(2)) is the number of two coordinate oxygen atoms, and n_(O(4)) isthe number of 4 coordinate oxygen atoms.

Thus, aluminoxanes which can be employed in the catalyst compositions ofthe present invention are represented generally by formulas such as(R—Al—O)_(p), R(R—Al—O)_(q)AlR₂, and the like. In these formulas, the Rgroup is typically a linear or branched C₁-C₆ alkyl, such as methyl,ethyl, propyl, butyl, pentyl, or hexyl. Examples of aluminoxanecompounds that can be used in accordance with the present inventioninclude, but are not limited to, methylaluminoxane, ethylaluminoxane,n-propylaluminoxane, iso-propylaluminoxane, n-butylaluminoxanc,t-butyl-aluminoxane, sec-butylaluminoxane, iso-butylaluminoxane,1-pentylaluminoxane, 2-pentylaluminoxane, 3-pentylaluminoxane,isopentylaluminoxane, neopentylaluminoxane, and the like, or anycombination thereof. Methylaluminoxane, ethylaluminoxane, andiso-butylaluminoxane are prepared from trimethylaluminum,triethylaluminum, or triisobutylaluminum, respectively, and sometimesare referred to as poly(methyl aluminum oxide), poly(ethyl aluminumoxide), and poly(isobutyl aluminum oxide), respectively. It is alsowithin the scope of the invention to use an aluminoxane in combinationwith a trialkylaluminum, such as that disclosed in U.S. Pat. No.4,794,096, incorporated herein by reference in its entirety.

The present invention contemplates many values of p and q in thealuminoxane formulas (R—Al—O)_(p), and R(R—Al—O)_(q)AlR₂, respectively.In some aspects, p and q are at least 3. However, depending upon how theorganoaluminoxane is prepared, stored, and used, the value of p and qcan vary within a single sample of aluminoxane, and such combinations oforganoaluminoxanes are contemplated herein.

In preparing a catalyst composition containing an aluminoxane, the molarratio of the total moles of aluminum in the aluminoxane (oraluminoxanes) to the total moles of metallocene compound(s) in thecomposition is generally between about 1:10 and about 100,000:1. Inanother aspect, the molar ratio is in a range from about 5:1 to about15,000:1. Optionally, aluminoxane can be added to a polymerization zonein ranges from about 0.01 mg/L to about 1000 mg/L, from about 0.1 mg/Lto about 100 mg/L, or from about 1 mg/L to about 50 mg/L.

Organoaluminoxanes can be prepared by various procedures. Examples oforganoalunminoxane preparations are disclosed in U.S. Pat. Nos.3,242,099 and 4,808,561, the disclosures of which are incorporatedherein by reference in their entirety. For example, water in an inertorganic solvent can be reacted with an aluminum alkyl compound, such as(R^(C))₃Al, to form the desired organoaluminoxane compound. While notintending to be bound by this statement, it is believed that thissynthetic method can afford a mixture of both linear and cyclic R—Al—Oaluminoxane species, both of which are encompassed by this invention.Alternatively, organoalunminoxanes are prepared by reacting an aluminumalkyl compound, such as (R^(C))₃Al, with a hydrated salt, such ashydrated copper sulfate, in an inert organic solvent.

Organoboron/Organoborate Compounds

According to another aspect of the present invention, the catalystcomposition can comprise an organoboron or organoborate compound. Suchcompounds include neutral boron compounds, borate salts, and the like,or combinations thereof. For example, fluoroorgano boron compounds andfluoroorgano borate compounds are contemplated.

Any fluoroorgano boron or fluoroorgano borate compound can be utilizedwith the present invention. Examples of fluoroorgano borate compoundsthat can be used in the present invention include, but are not limitedto, fluorinated aryl borates such as N,N-dimethylaniliniunmtetrakis(pentafluorophenyl)borate, triphenylcarbeniumtetrakis(pentafluorophenyl)borate, lithiumtetrakis(pentafluorophenyl)borate, N,N-dimethylaniliniumtetrakis[3,5-bis(trifluoromethyl)phenyl]borate, triphenylcarbeniumtetrakis[3,5-bis(trifluoromethyl)phenyl]borate, and the like, ormixtures thereof. Examples of fluoroorgano boron compounds that can beused as co-catalysts in the present invention include, but are notlimited to, tris(pentafluorophenyl)boron,tris[3,5-bis(trifluoromethyl)phenyl]boron, and the like, or mixturesthereof. Although not intending to be bound by the following theory,these examples of fluoroorgano borate and fluoroorgano boron compounds,and related compounds, are thought to form “weakly-coordinating” anionswhen combined with organometal or metallocene compounds, as disclosed inU.S. Pat. No. 5,919,983, the disclosure of which is incorporated hereinby reference in its entirety. Applicants also contemplate the use ofdiboron, or bis-boron, compounds or other bifunctional compoundscontaining two or more boron atoms in the chemical structure, such asdisclosed in J. Am. Chem. Soc., 2005, 127, pp. 14756-14768, the contentof which is incorporated herein by reference in its entirety.

Generally, any amount of organoboron compound can be used. According toone aspect of this invention, the molar ratio of the total moles oforganoboron or organoborate compound (or compounds) to the total molesof metallocene compounds in the catalyst composition is in a range fromabout 0.1:1 to about 15:1. Typically, the amount of the fluoroorganoboron or fluoroorgano borate compound used is from about 0.5 moles toabout 10 moles of boron/borate compound per mole of metallocenecompounds (catalyst component I, catalyst component II, and any othermetallocene compound(s)). According to another aspect of this invention,the amount of fluoroorgano boron or fluoroorgano borate compound is fromabout 0.8 moles to about 5 moles of boron/borate compound per mole ofmetallocene compounds.

Ionizing Ionic Compounds

The present invention further provides a catalyst composition which cancomprise an ionizing ionic compound. An ionizing ionic compound is anionic compound that can function as a co-catalyst to enhance theactivity of the catalyst composition. While not intending to be bound bytheory, it is believed that the ionizing ionic compound is capable ofreacting with a metallocene compound and converting the metallocene intoone or more cationic metallocene compounds, or incipient cationicmetallocene compounds. Again, while not intending to be bound by theory,it is believed that the ionizing ionic compound can function as anionizing compound by completely or partially extracting an anionicligand, possibly a non-alkadienyl ligand, from the metallocene. However,the ionizing ionic compound is an activator or co-catalyst regardless ofwhether it is ionizes the metallocene, abstracts a ligand in a fashionas to form an ion pair, weakens the metal-ligand bond in themetallocene, simply coordinates to a ligand, or activates themetallocene by some other mechanism.

Further, it is not necessary that the ionizing ionic compound activatethe metallocene compound(s) only. The activation function of theionizing ionic compound can be evident in the enhanced activity ofcatalyst composition as a whole, as compared to a catalyst compositionthat does not contain an ionizing ionic compound.

Examples of ionizing ionic compounds include, but are not limited to,the following compounds: tri(n-butyl)ammonium tetrakis(p-tolyl)borate,tri(n-butyl) ammonium tetrakis(m-tolyl)borate, tri(n-butyl)ammoniumtetrakis(2,4-dimethylphenyl)borate, tri(n-butyl)ammoniumtetrakis(3,5-dimethylphenyl)borate, tri(n-butyl)ammoniumtetrakis[3,5-bis(trifluoromethyl)phenyl]borate, tri(n-butyl)ammoniumtetrakis(pentafluorophenyl)borate, N,N-dimethylaniliniumtetrakis(p-tolyl)borate, N,N-dimethylanilinium tetrakis(m-tolyl)borate,N,N-dimethylanilinium tetrakis(2,4-di methylphenyl)borate,N,N-dimethylanilinium tetrakis(3,5-dimethylphenyl)borate,N,N-dimethylanilinium tetrakis[3,5-bis(trifluoro-methyl)phenyl]borate,N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate,triphenylcarbenium tetrakis(p-tolyl)borate, triphenylcarbeniumtetrakis(m-tolyl)borate, triphenylcarbeniumtetrakis(2,4-dimethylphenyl)borate, triphenylcarbeniumtetrakis(3,5-dimethylphenyl)borate, triphenylcarbeniumtetrakis[3,5-bis(trifluoromethyl)phenyl]borate, triphenylcarbeniumtetrakis(pentafluorophenyl)borate, tropylium tetrakis(p-tolyl)borate,tropylium tetrakis(m-tolyl)borate, tropyliumtetrakis(2,4-dimethylphenyl)borate, tropyliumtetrakis(3,5-dimethylphenyl)borate, tropyliumtetrakis[3,5-bis(trifluoro-methyl)phenyl]borate, tropyliumtetrakis(pentafluorophenyl)borate, lithiumtetrakis(pentafluorophenyl)borate, lithium tetraphenylborate, lithiumtetrakis(p-tolyl)borate, lithium tetrakis(m-tolyl)borate, lithiumtetrakis(2,4-dimethylphenyl)borate, lithiumtetrakis(3,5-dimethylphenyl)borate, lithium tetrafluoroborate, sodiumtetrakis(pentafluorophenyl)borate, sodium tetraphenylborate, sodiumtetrakis(p-tolyl)borate, sodium tetrakis(m-tolyl)borate, sodiumtetrakis(2,4-dimethylphenyl)borate, sodiumtetrakis(3,5-dimethylphenyl)borate, sodium tetrafluoroborate, potassiumtetrakis-(pentafluorophenyl)borate, potassium tetraphenylborate,potassium tetrakis(p-tolyl)borate, potassium tetrakis(m-tolyl)borate,potassium tetrakis(2,4-dimethyl-phenyl)borate, potassiumtetrakis(3,5-dimethylphenyl)borate, potassium tetrafluoroborate, lithiumtetrakis(pentafluorophenyl)aluminate, lithium tetraphenylaluminate,lithium tetrakis(p-tolyl)aluminate, lithium tetrakis(m-tolyl)aluminate,lithium tetrakis(2,4-dimethylphenyl)aluminate, lithiumtetrakis(3,5-dimethylphenyl)aluminate, lithium tetrafluoroaluminate,sodium tetrakis(pentafluoro-phenyl)aluminate, sodiumtetraphenylaluminate, sodium tetrakis(p-tolyl)aluminate, sodiumtetrakis(m-tolyl)aluminate, sodiumtetrakis(2,4-dimethylphenyl)aluminate, sodiumtetrakis(3,5-dimethylphenyl)aluminate, sodium tetrafluoroaluminate,potassium tetrakis(pentafluorophenyl)aluminate, potassiumtetraphenylaluminate, potassium tetrakis(p-tolyl)aluminate, potassiumtetrakis(m-tolyl)aluminate, potassiumtetrakis(2,4-dimethylphenyl)aluminate, potassiumtetrakis(3,5-dimethylphenyl)aluminate, potassium tetrafluoroaluminate,and the like, or combinations thereof. Ionizing ionic compounds usefulin this invention are not limited to these; other examples of ionizingionic compounds are disclosed in U.S. Pat. Nos. 5,576,259 and 5,807,938,the disclosures of which are incorporated herein by reference in theirentirety.

Olefin Monomers

Unsaturated reactants that can be employed with catalyst compositionsand polymerization processes of this invention typically include olefincompounds having from 2 to 30 carbon atoms per molecule and having atleast one olefinic double bond. This invention encompasseshomopolymerization processes using a single olefin such as ethylene orpropylene, as well as copolymerization, terpolymerization, etc.,reactions using an olefin monomer with at least one different olefiniccompound. For example, the resultant ethylene copolymers, terpolymers,etc., generally contain a major amount of ethylene (>50 mole percent)and a minor amount of comonomer (<50 mole percent), though this is not arequirement. Comonomers that can be copolymerized with ethylene oftenhave from 3 to 20 carbon atoms in their molecular chain.

Acyclic, cyclic, polycyclic, terminal (α), internal, linear, branched,substituted, unsubstituted, functionalized, and non-functionalizedolefins can be employed in this invention. For example, typicalunsaturated compounds that can be polymerized with the catalystcompositions of this invention include, but are not limited to,ethylene, propylene, 1-butene, 2-butene, 3-methyl-1-butene, isobutylene,1-pentene, 2-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-hexene,2-hexene, 3-hexene, 3-ethyl-1-hexene, 1-heptene, 2-heptene, 3-heptene,the four normal octenes (e.g., 1-octene), the four normal nonenes, thefive normal decenes, and the like, or mixtures of two or more of thesecompounds. Cyclic and bicyclic olefins, including but not limited to,cyclopentene, cyclohexene, norbornylene, norbornadiene, and the like,also can be polymerized as described above. Styrene can also be employedas a monomer in the present invention. In an aspect, the olefin monomeris a C₂-C₁₀ olefin; alternatively, the olefin monomer is ethylene; oralternatively, the olefin monomer is propylene.

When a copolymer (or alternatively, a terpolymer) is desired, the olefinmonomer can comprise, for example, ethylene or propylene, which iscopolymerized with at least one comonomer. According to one aspect ofthis invention, the olefin monomer in the polymerization processcomprises ethylene. In this aspect, examples of suitable olefincomonomers include, but are not limited to, propylene, 1-butene,2-butene, 3-methyl-1-butene, isobutylene, 1-pentene, 2-pentene,3-methyl-1-pentene, 4-methyl-1-pentene, 1-hexene, 2-hexene,3-ethyl-1-hexene, 1-heptene, 2-heptene, 3-heptene, 1-octene, 1-decene,styrene, and the like, or combinations thereof. According to one aspectof the present invention, the comonomer can comprise 1-butene,1-pentene, 1-hexene, 1-octene, 1-decene, styrene, or any combinationthereof.

Generally, the amount of comonomer introduced into a reactor zone toproduce the copolymer is from about 0.01 to about 50 weight percent ofthe comonomer based on the total weight of the monomer and comonomer.According to another aspect of the present invention, the amount ofcomonomer introduced into a reactor zone is from about 0.01 to about 40weight percent comonomer based on the total weight of the monomer andcomonomer. In still another aspect, the amount of comonomer introducedinto a reactor zone is from about 0.1 to about 35 weight percentcomonomer based on the total weight of the monomer and comonomer. Yet,in another aspect, the amount of comonomer introduced into a reactorzone is from about 0.5 to about 20 weight percent comonomer based on thetotal weight of the monomer and comonomer.

While not intending to be bound by this theory, where branched,substituted, or functionalized olefins are used as reactants, it isbelieved that a steric hindrance can impede and/or slow thepolymerization process. Thus, branched and/or cyclic portion(s) of theolefin removed somewhat from the carbon-carbon double bond would not beexpected to hinder the reaction in the way that the same olefinsubstituents situated more proximate to the carbon-carbon double bondmight. According to one aspect of the present invention, at least onemonomer/reactant is ethylene, so the polymerizations are either ahomopolymerization involving only ethylene, or copolymerizations with adifferent acyclic, cyclic, terminal, internal, linear, branched,substituted, or unsubstituted olefin. In addition, the catalystcompositions of this invention can be used in the polymerization ofdiolefin compounds including, but not limited to, 1,3-butadiene,isoprene, 1,4-pentadiene, and 1,5-hexadiene.

Catalyst Composition

The present invention employs catalyst compositions containing catalystcomponent I, catalyst component II, and at least one activator. Forexample, in one aspect, a suitable catalyst composition can comprisecatalyst component I, catalyst component II, and an activator-support(e.g., a chemically-treated solid oxide), while in another aspect, asuitable catalyst composition can comprise catalyst component I,catalyst component II, and an aluminoxane (e.g., methylaluminoxane).Optionally, these catalyst compositions can further comprise one or moreorganoaluminum compounds. These catalyst compositions can be utilized toproduce polyolefins—homopolymers, copolymers, and the like—for a varietyof end-use applications. The catalyst components I and II were discussedabove.

In accordance with aspects of the present invention, it is contemplatedthat catalyst component I can contain more than one bridged metallocenecompound and/or catalyst component II can contain more than onemetallocene compound. Further, additional metallocene compounds—otherthan those specified in catalyst component I or catalyst componentII—can be employed in the catalyst composition and/or the polymerizationprocess, provided that the additional metallocene compound(s) does notdetract from the advantages disclosed herein. Additionally, more thanone activator (e.g., more than one activator-support, a combination ofan activator-support and an aluminoxane, etc.) and/or more than oneorganoaluminum compound also may be utilized.

Catalyst compositions of the present invention can comprise catalystcomponent I, catalyst component II, and at least one activator. Forinstance, the activator can comprise an activator-support, analuminoxane compound, an organoboron or organoborate compound, anionizing ionic compound, and the like, or any combination thereof.Accordingly, the catalyst composition can comprise catalyst component I,catalyst component II, and an activator-support; alternatively, thecatalyst composition can comprise catalyst component I, catalystcomponent II, and an aluminoxane compound; alternatively, the catalystcomposition can comprise catalyst component I, catalyst component II,and an organoboron or organoborate compound; or alternatively, thecatalyst composition can comprise catalyst component I, catalystcomponent II, and an ionizing ionic compound. Optionally, the catalystcomposition can further comprise an organoaluminum compound.

In some aspects, catalyst compositions of the present invention cancomprise catalyst component I, catalyst component II, at least oneactivator-support, and at least one organoaluminum compound. Forinstance, the activator-support can comprise fluorided alumina,chlorided alumina, bromided alumina, sulfated alumina, fluoridedsilica-alumina, chlorided silica-alumina, bromided silica-alumina,sulfated silica-alumina, fluorided silica-zirconia, chloridedsilica-zirconia, bromided silica-zirconia, sulfated silica-zirconia,fluorided silica-titania, fluorided silica-coated alumina, sulfatedsilica-coated alumina, phosphated silica-coated alumina, and the like,or combinations thereof. Additionally, the organoaluminum compound cancomprise trimethylaluminum, triethylaluminum, tri-n-propylaluminum,tri-n-butylaluminum, triisobutylaluminum, tri-n-hexylaluminum,tri-n-octylaluminum, diisobutylaluminum hydride, diethylaluminumethoxide, diethylaluminum chloride, and the like, or combinationsthereof.

In another aspect of the present invention, a catalyst composition isprovided which comprises catalyst component I, catalyst component II, anactivator-support, and an organoaluminum compound, wherein this catalystcomposition is substantially free of aluminoxanes, organoboron ororganoborate compounds, ionizing ionic compounds, and/or other similarmaterials; alternatively, substantially free of aluminoxanes;alternatively, substantially free of organoboron or organoboratecompounds; or alternatively, substantially free of ionizing ioniccompounds. In these aspects, the catalyst composition has catalystactivity, to be discussed below, in the absence of these additionalmaterials. For example, a catalyst composition of the present inventioncan consist essentially of catalyst component I, catalyst component II,an activator-support, and an organoaluminum compound, wherein no othermaterials are present in the catalyst composition which wouldincrease/decrease the activity of the catalyst composition by more thanabout 10% from the catalyst activity of the catalyst composition in theabsence of said materials.

However, in other aspects of this invention, theseactivators/co-catalysts can be employed. For example, a catalystcomposition comprising catalyst component I, catalyst component II, anactivator-support, and an organoaluminum compound, can further comprisean optional co-catalyst. Suitable co-catalysts in this aspect include,but are not limited to, aluminoxane compounds, organoboron ororganoborate compounds, ionizing ionic compounds, and the like, or anycombination thereof. More than one co-catalyst can be present in thecatalyst composition.

In a particular aspect contemplated herein, the catalyst composition isa dual catalyst composition comprising an activator (one or more thanone), optionally an organoaluminum compound (one or more than one), onlyone catalyst component I metallocene compound, and only one catalystcomponent I metallocene compound. In these and other aspects, thecatalyst composition can comprise an activator, optionally, anorganoaluminum compound; only one compound having formula (C) or formula(D); and only one compound selected from MET-II-A, MET-II-B, MET-II-C,MET-II-D, MET-II-E, MET-II-F, MET-II-G, MET-II-H, or a compound havingformula (E). For instance, the catalyst composition can comprise anactivator-support, an organoaluminum compound, only one compound havingformula (C), and MET-II-A; alternatively, the catalyst composition cancomprise an activator-support, an organoaluminum compound, only onecompound having formula (C), and MET-II-B; alternatively, the catalystcomposition can comprise an activator-support, an organoaluminumcompound, only one compound having formula (C), and MET-II-C;alternatively, the catalyst composition can comprise anactivator-support, an organoaluminum compound, only one compound havingformula (C), and MET-II-D; alternatively, the catalyst composition cancomprise an activator-support, an organoaluminum compound, only onecompound having formula (C), and MET-II-E; alternatively, the catalystcomposition can comprise an activator-support, an organoaluminumcompound, only one compound having formula (C), and MET-II-F;alternatively, the catalyst composition can comprise anactivator-support, an organoaluminum compound, only one compound havingformula (C), and MET-II-G; alternatively, the catalyst composition cancomprise an activator-support, an organoaluminum compound, only onecompound having formula (C), and MET-II-H; alternatively, the catalystcomposition can comprise an activator-support, an organoaluminumcompound, only one compound having formula (C), and only one compoundhaving formula (E); alternatively, the catalyst composition can comprisean activator-support, an organoaluminum compound, only one compoundhaving formula (D), and MET-II-A; alternatively, the catalystcomposition can comprise an activator-support, an organoaluminumcompound, only one compound having formula (D), and MET-II-B;alternatively, the catalyst composition can comprise anactivator-support, an organoaluminum compound, only one compound havingformula (D), and MET-II-C; alternatively, the catalyst composition cancomprise an activator-support, an organoaluminum compound, only onecompound having formula (D), and MET-II-D; alternatively, the catalystcomposition can comprise an activator-support, an organoaluminumcompound, only one compound having formula (D), and MET-II-E;alternatively, the catalyst composition can comprise anactivator-support, an organoaluminum compound, only one compound havingformula (D), and MET-II-F; alternatively, the catalyst composition cancomprise an activator-support, an organoaluminum compound, only onecompound having formula (D), and MET-II-G; alternatively, the catalystcomposition can comprise an activator-support, an organoaluminumcompound, only one compound having formula (D), and MET-II-H; oralternatively, the catalyst composition can comprise anactivator-support, an organoaluminum compound, only one compound havingformula (D), and only one compound having formula (E). In these aspects,only two metallocene compounds are present in the catalyst composition,i.e., one catalyst component I metallocene compound and one catalystcomponent II metallocene compound. It is also contemplated that a dualmetallocene catalyst composition can contain minor amounts of anadditional metallocene compound(s), but this is not a requirement, andgenerally the dual catalyst composition can consist essentially of theaforementioned two metallocene compounds, and in the substantial absenceof any additional metallocene compounds, wherein any additionalmetallocene compounds would not increase/decrease the activity of thecatalyst composition by more than about 10% from the catalyst activityof the catalyst composition in the absence of the additional metallocenecompounds.

This invention further encompasses methods of making these catalystcompositions, such as, for example, contacting the respective catalystcomponents in any order or sequence.

The metallocene compound from catalyst component I, catalyst componentII, or both, can be precontacted with an olefinic monomer if desired,not necessarily the olefin monomer to be polymerized, and anorganoaluminum compound for a first period of time prior to contactingthis precontacted mixture with an activator-support. The first period oftime for contact, the precontact time, between the metallocene compoundor compounds, the olefinic monomer, and the organoaluminum compoundtypically ranges from a time period of about 1 minute to about 24 hours,for example, from about 0.05 hours to about 1 hour. Precontact timesfrom about 10 minutes to about 30 minutes are also employed.Alternatively, the precontacting process is carried out in multiplesteps, rather than a single step, in which multiple mixtures areprepared, each comprising a different set of catalyst components. Forexample, at least two catalyst components are contacted forming a firstmixture, followed by contacting the first mixture with at least oneother catalyst component forming a second mixture, and so forth.

Multiple precontacting steps can be carried out in a single vessel or inmultiple vessels. Further, multiple precontacting steps can be carriedout in series (sequentially), in parallel, or a combination thereof. Forexample, a first mixture of two catalyst components can be formed in afirst vessel, a second mixture comprising the first mixture plus oneadditional catalyst component can be formed in the first vessel or in asecond vessel, which is typically placed downstream of the first vessel.

In another aspect, one or more of the catalyst components can be splitand used in different precontacting treatments. For example, pan of acatalyst component is fed into a first precontacting vessel forprecontacting with at least one other catalyst component, while theremainder of that same catalyst component is fed into a secondprecontacting vessel for precontacting with at least one other catalystcomponent, or is fed directly into the reactor, or a combinationthereof. The precontacting can be carried out in any suitable equipment,such as tanks, stirred mix tanks, various static mixing devices, aflask, a vessel of any type, or combinations of these apparatus.

In another aspect of this invention, the various catalyst components(for example, metallocene(s), activator-support, organoaluminumco-catalyst, and optionally an unsaturated hydrocarbon) are contacted inthe polymerization reactor simultaneously while the polymerizationreaction is proceeding. Alternatively, any two or more of these catalystcomponents can be precontacted in a vessel prior to entering thereaction zone. This precontacting step can be continuous, in which theprecontacted product is fed continuously to the reactor, or it can be astepwise or batchwise process in which a batch of precontacted productis added to make a catalyst composition. This precontacting step can becarried out over a time period that can range from a few seconds to asmuch as several days, or longer. In this aspect, the continuousprecontacting step generally lasts from about 1 second to about 1 hour.In another aspect, the continuous precontacting step lasts from about 10seconds to about 45 minutes, or from about 1 minute to about 30 minutes.

Once the precontacted mixture of the metallocene compound(s), olefinmonomer, and organoaluminum co-catalyst is contacted with theactivator-support, this composition (with the addition of theactivator-support) is termed the “postcontacted mixture.” Thepostcontacted mixture optionally remains in contact for a second periodof time, the postcontact time, prior to initiating the polymerizationprocess. Postcontact times between the precontacted mixture and theactivator-support generally range from about 1 minute to about 24 hours.In a further aspect, the postcontact time is in a range from about 0.05hours to about 1 hour. The precontacting step, the postcontacting step,or both, can increase the productivity of the polymer as compared to thesame catalyst composition that is prepared without precontacting orpostcontacting. However, neither a precontacting step nor apostcontacting step is required.

The postcontacted mixture can be heated at a temperature and for a timeperiod sufficient to allow adsorption, impregnation, or interaction ofprecontacted mixture and the activator-support, such that a portion ofthe components of the precontacted mixture is immobilized, adsorbed, ordeposited thereon. Where heating is employed, the postcontacted mixturegenerally is heated to a temperature of from between about 0° F. toabout 150° F., or from about 40° F. to about 95° F.

According to one aspect of this invention, the molar ratio of the molesof metallocene compounds to the moles of organoaluminum compound in acatalyst composition generally is in a range from about 1:1 to about1:10,000. In another aspect, the molar ratio is in a range from about1:1 to about 1:1,000. Yet, in another aspect, the molar ratio of themoles of metallocene compounds to the moles of organoaluminum compoundis in a range from about 1:1 to about 1:100. These molar ratios reflectthe ratio of total moles of metallocene compounds (catalyst component I,catalyst component II, other metallocenes, etc.) to the total amount oforganoaluminum compound (or compounds) in both the precontacted mixtureand the postcontacted mixture combined, if precontacting and/orpostcontacting steps are employed.

When a precontacting step is used, the molar ratio of the total moles ofolefin monomer to total moles of metallocene(s) in the precontactedmixture is typically in a range from about 1:10 to about 100,000:1.Total moles of each component are used in this ratio to account foraspects of this invention where more than one olefin monomer and/or morethan one metallocene is employed in a precontacting step. Further, thismolar ratio can be in a range from about 10:1 to about 1,000:1 inanother aspect of the invention.

Generally, the weight ratio of organoaluminum compound toactivator-support is in a range from about 10:1 to about 1:1000. If morethan one organoaluminum compound and/or more than one activator-supportis employed, this ratio is based on the total weight of each respectivecomponent. In another aspect, the weight ratio of the organoaluminumcompound to the activator-support is in a range from about 3:1 to about1:100, or from about 1:1 to about 1:50.

In some aspects of this invention, the weight ratio of metallocenes toactivator-support is in a range from about 1:1 to about 1:1,000,000. Ifmore than one activator-support is employed, this ratio is based on thetotal weight of each respective component. In another aspect, thisweight ratio is in a range from about 1:5 to about 1:100,000, or fromabout 1:10 to about 1:10,000. Yet, in another aspect, the weight ratioof the metallocene compounds to the activator-support is in a range fromabout 1:20 to about 1:1000.

In one aspect of this invention, the molar ratio of catalyst component Ito catalyst component II in the catalyst composition is in a range fromabout 5:1 to about 100:1, such as, for example, from about 6:1 to about75:1, from about 7:1 to about 50:1, or from about 8:1 to about 25:1.Yet, in another aspect, the molar ratio of catalyst component I tocatalyst component II in the catalyst composition ranges from about 5:1to about 20:1. For instance, the molar ratio of catalyst component I tocatalyst component II in the catalyst composition can be in a range fromabout 6:1 to about 18:1, from about 7:1 to about 16:1, or from about 8:1to about 15:1. According to still another aspect of the invention, molarratios of catalyst component I to catalyst component II in the catalystcomposition of about 6:1, about 7:1, about 8:1, about 9:1, about 10:1,about 11:1, about 12:1, about 13:1, about 14:1, about 15:1, about 16:1,about 17:1, and about 18:1, are contemplated herein.

Catalyst compositions of the present invention generally have a catalystactivity greater than about 100 grams of polyethylene (homopolymer,copolymer, etc., as the context requires) per gram of activator-supportper hour (abbreviated gP/(gAS·hr)). In another aspect, the catalystactivity is greater than about 150, greater than about 200, or greaterthan about 250 gP/(gAS·hr). In still another aspect, catalystcompositions of this invention are characterized by having a catalystactivity greater than about 500, greater than about 1000, or greaterthan about 1500 gP/(gAS·hr). Yet, in another aspect, the catalystactivity is greater than about 2000 gP/(gAS·hr). This activity ismeasured under slurry polymerization conditions using isobutane as thediluent, at a polymerization temperature of about 90° C. and an ethylenepressure of about 550 psig.

As discussed above, any combination of the metallocene compound(s), theactivator-support, the organoaluminum compound, and the olefin monomer,can be precontacted in some aspects of this invention. When anyprecontacting occurs with an olefinic monomer, it is not necessary thatthe olefin monomer used in the precontacting step be the same as theolefin to be polymerized. Further, when a precontacting step among anycombination of the catalyst components is employed for a first period oftime, this precontacted mixture can be used in a subsequentpostcontacting step between any other combination of catalyst componentsfor a second period of time. For example, the metallocene compounds, theorganoaluminum compound, and 1-hexene can be used in a precontactingstep for a first period of time, and this precontacted mixture then canbe contacted with the activator-support to form a postcontacted mixturethat is contacted for a second period of time prior to initiating thepolymerization reaction. For example, the first period of time forcontact, the precontact time, between any combination of the metallocenecompound(s), the olefinic monomer, the activator-support, and theorganoaluminum compound can be from about 1 minute to about 24 hours,from about 3 minutes to about 1 hour, or from about 10 minutes to about30 minutes. The postcontacted mixture optionally is allowed to remain incontact for a second period of time, the postcontact time, prior toinitiating the polymerization process. According to one aspect of thisinvention, postcontact times between the precontacted mixture and anyremaining catalyst components is from about 1 minute to about 24 hours,or from about 0.1 hour to about 1 hour.

Polymerization Process

Catalyst compositions of the present invention can be used to polymerizeolefins to form homopolymers, copolymers, terpolymers, and the like. Onesuch process for polymerizing olefins in the presence of a catalystcomposition of the present invention comprises contacting the catalystcomposition with an olefin monomer and optionally an olefin comonomerunder polymerization conditions to produce an olefin polymer, whereinthe catalyst composition comprises catalyst component I, catalystcomponent II, an activator (e.g., an activator-support, an aluminoxane,etc.), and optionally an organoaluminum compound. Catalyst component Ican comprise a compound having formula (C), a compound having formula(D), or a combination thereof. Catalyst component II can compriseMET-II-A, MET-II-B, MET-II-C, MET-II-D, MET-II-E, MET-II-F, MET-II-G,MET-II-H, or a compound having formula (E), or a combination thereof.The activator can comprise an activator-support, an aluminoxanecompound, an organoboron or organoborate compound, an ionizing ioniccompound, and the like, or combinations thereof. The activator-supportcan comprise fluorided alumina, chlorided alumina, bromided alumina,sulfated alumina, fluorided silica-alumina, chlorided silica-alumina,bromided silica-alumina, sulfated silica-alumina, fluoridedsilica-zirconia, chlorided silica-zirconia, bromided silica-zirconia,sulfated silica-zirconia, fluorided silica-titania, fluoridedsilica-coated alumina, sulfated silica-coated alumina, phosphatedsilica-coated alumina, and the like, or combinations thereof. Theorganoaluminum compound can comprise trimethylaluminum,triethylaluminum, tri-n-propylaluminum, tri-n-butylaluminum,triisobutylaluminum, tri-n-hexylaluminum, tri-n-octylaluminum,diisobutylaluminum hydride, diethylaluminum ethoxide, diethylaluminumchloride, and the like, or combinations thereof.

In accordance with another aspect of the invention, the polymerizationprocess can employ a catalyst composition comprising only one catalystcomponent I metallocene compound (e.g., a metallocene compound havingformula (C) or formula (D)); only one catalyst component II metallocenecompound (e.g., MET-II-A, MET-II-B, or MET-II-C); at least one activator(e.g., at least one activator-support); and optionally, at least oneorganoaluminum compound.

The catalyst compositions of the present invention are intended for anyolefin polymerization method using various types of polymerizationreactors. As used herein, “polymerization reactor” includes anypolymerization reactor capable of polymerizing olefin monomers andcomonomers (one or more than one comonomer) to produce homopolymers,copolymers, terpolymers, and the like. The various types of reactorsinclude those that may be referred to as a batch reactor, slurryreactor, gas-phase reactor, solution reactor, high pressure reactor,tubular reactor, autoclave reactor, and the like, or combinationsthereof. The polymerization conditions for the various reactor types arewell known to those of skill in the art. Gas phase reactors may comprisefluidized bed reactors or staged horizontal reactors. Slurry reactorsmay comprise vertical or horizontal loops. High pressure reactors maycomprise autoclave or tubular reactors. Reactor types can include batchor continuous processes. Continuous processes could use intermittent orcontinuous product discharge. Processes may also include partial or fulldirect recycle of unreacted monomer, unreacted comonomer, and/ordiluent.

Polymerization reactor systems of the present invention may comprise onetype of reactor in a system or multiple reactors of the same ordifferent type. Production of polymers in multiple reactors may includeseveral stages in at least two separate polymerization reactorsinterconnected by a transfer device making it possible to transfer thepolymers resulting from the first polymerization reactor into the secondreactor. The desired polymerization conditions in one of the reactorsmay be different from the operating conditions of the other reactors.Alternatively, polymerization in multiple reactors may include themanual transfer of polymer from one reactor to subsequent reactors forcontinued polymerization. Multiple reactor systems may include anycombination including, but not limited to, multiple loop reactors,multiple gas phase reactors, a combination of loop and gas phasereactors, multiple high pressure reactors, or a combination of highpressure with loop and/or gas phase reactors. The multiple reactors maybe operated in series, in parallel, or both.

According to one aspect of the invention, the polymerization reactorsystem may comprise at least one loop slurry reactor comprising verticalor horizontal loops. Monomer, diluent, catalyst, and comonomer may becontinuously fed to a loop reactor where polymerization occurs.Generally, continuous processes may comprise the continuous introductionof monomer/comonomer, a catalyst, and a diluent into a polymerizationreactor and the continuous removal from this reactor of a suspensioncomprising polymer particles and the diluent. Reactor effluent may beflashed to remove the solid polymer from the liquids that comprise thediluent, monomer and/or comonomer. Various technologies may be used forthis separation step including but not limited to, flashing that mayinclude any combination of heat addition and pressure reduction;separation by cyclonic action in either a cyclone or hydrocyclone; orseparation by centrifugation.

A typical slurry polymerization process (also known as the particle formprocess) is disclosed, for example, in U.S. Pat. Nos. 3,248,179,4,501,885, 5,565,175, 5,575,979, 6,239,235, 6,262,191, and 6,833,415,each of which is incorporated herein by reference in its entirety.

Suitable diluents used in slurry polymerization include, but are notlimited to, the monomer being polymerized and hydrocarbons that areliquids under reaction conditions. Examples of suitable diluentsinclude, but are not limited to, hydrocarbons such as propane,cyclohexane, isobutane, n-butane, n-pentane, isopentane, neopentane, andn-hexane. Some loop polymerization reactions can occur under bulkconditions where no diluent is used. An example is polymerization ofpropylene monomer as disclosed in U.S. Pat. No. 5,455,314, which isincorporated by reference herein in its entirety.

According to yet another aspect of this invention, the polymerizationreactor may comprise at least one gas phase reactor. Such systems mayemploy a continuous recycle stream containing one or more monomerscontinuously cycled through a fluidized bed in the presence of thecatalyst under polymerization conditions. A recycle stream may bewithdrawn from the fluidized bed and recycled back into the reactor.Simultaneously, polymer product may be withdrawn from the reactor andnew or fresh monomer may be added to replace the polymerized monomer.Such gas phase reactors may comprise a process for multi-step gas-phasepolymerization of olefins, in which olefins are polymerized in thegaseous phase in at least two independent gas-phase polymerization zoneswhile feeding a catalyst-containing polymer formed in a firstpolymerization zone to a second polymerization zone. One type of gasphase reactor is disclosed in U.S. Pat. Nos. 5,352,749, 4,588,790, and5,436,304, each of which is incorporated by reference in its entiretyherein.

According to still another aspect of the invention, a high pressurepolymerization reactor may comprise a tubular reactor or an autoclavereactor. Tubular reactors may have several zones where fresh monomer,initiators, or catalysts are added. Monomer may be entrained in an inertgaseous stream and introduced at one zone of the reactor. Initiators,catalysts, and/or catalyst components may be entrained in a gaseousstream and introduced at another zone of the reactor. The gas streamsmay be intermixed for polymerization. Heat and pressure may be employedappropriately to obtain optimal polymerization reaction conditions.

According to yet another aspect of the invention, the polymerizationreactor may comprise a solution polymerization reactor wherein themonomer/comonomer are contacted with the catalyst composition bysuitable stirring or other means. A carrier comprising an inert organicdiluent or excess monomer may be employed. If desired, themonomer/comonomer may be brought in the vapor phase into contact withthe catalytic reaction product, in the presence or absence of liquidmaterial. The polymerization zone is maintained at temperatures andpressures that will result in the formation of a solution of the polymerin a reaction medium. Agitation may be employed to obtain bettertemperature control and to maintain uniform polymerization mixturesthroughout the polymerization zone. Adequate means are utilized fordissipating the exothermic heat of polymerization.

Polymerization reactors suitable for the present invention may furthercomprise any combination of at least one raw material feed system, atleast one feed system for catalyst or catalyst components, and/or atleast one polymer recovery system. Suitable reactor systems for thepresent invention may further comprise systems for feedstockpurification, catalyst storage and preparation, extrusion, reactorcooling, polymer recovery, fractionation, recycle, storage, loadout,laboratory analysis, and process control.

Polymerization conditions that are controlled for efficiency and toprovide desired polymer properties can include temperature, pressure,and the concentrations of various reactants. Polymerization temperaturecan affect catalyst productivity, polymer molecular weight, andmolecular weight distribution. A suitable polymerization temperature maybe any temperature below the de-polymerization temperature according tothe Gibbs Free energy equation. Typically, this includes from about 60°C. to about 280° C., for example, or from about 60° C. to about 110° C.,depending upon the type of polymerization reactor. In some reactorsystems, the polymerization temperature generally is within a range fromabout 70° C. to about 90° C., or from about 75° C. to about 85° C.

Suitable pressures will also vary according to the reactor andpolymerization type. The pressure for liquid phase polymerizations in aloop reactor is typically less than 1000 psig. Pressure for gas phasepolymerization is usually at about 200 to 500 psig. High pressurepolymerization in tubular or autoclave reactors is generally run atabout 20,000 to 75,000 psig. Polymerization reactors can also beoperated in a supercritical region occurring at generally highertemperatures and pressures. Operation above the critical point of apressure/temperature diagram (supercritical phase) may offer advantages.

According to one aspect of this invention, the ratio of hydrogen to theolefin monomer in the polymerization process is controlled. This weightratio can range from 0 ppm to about 10,000 ppm of hydrogen, based on theweight of the olefin monomer. For instance, the reactant or feed ratioof hydrogen to olefin monomer can be controlled at a weight ratio whichfalls within a range from about 10 ppm to about 7500 ppm, from about 10ppm to about 5000 ppm, or from about 10 ppm to about 1000 ppm.

It is also contemplated that monomer, comonomer (or comonomers), and/orhydrogen can be periodically pulsed to the reactor, for instance, in amanner similar to that employed in U.S. Pat. No. 5,739,220 and U.S.Patent Publication No. 2004/0059070, the disclosures of which areincorporated herein by reference in their entirety.

In ethylene polymerizations, the feed ratio of hydrogen to ethylenemonomer, irrespective of comonomer(s) employed, generally is controlledat a weight ratio within a range from about 0 ppm to about 1000 ppm, butthe specific weight ratio target can depend upon the desired polymermolecular weight or melt index (MI). For ethylene polymers(homopolymers, copolymers, etc.) having a MI around 1 g/10 min, theweight ratio of hydrogen to ethylene is typically in a range from about5 ppm to about 300 ppm, such as, for example, from about 10 ppm to about250 ppm, or from about 10 ppm to about 200 ppm.

Processes of the present invention which utilize a catalyst compositioncomprising catalyst component I, catalyst component II, and an activator(e.g., an activator-support, and optionally an organoaluminum compound),unexpectedly, can provide an increase in polymer production rate, orpolymer output rate (lb/hr). For instance, in one aspect of thisinvention, an amount of the olefin polymer produced per hour by theprocess (e.g., a continuous polymerization process) is at least 10%greater than an amount of an olefin polymer obtained per hour under thesame polymerization conditions without catalyst component II. In anotheraspect, the amount of the olefin polymer produced per hour by theprocess is from about 10% to about 50%, from about 10% to about 40%, orfrom about 10% to about 30%, greater than the amount of the olefinpolymer obtained per hour under the same polymerization conditionswithout catalyst component II. In yet another aspect, the amount of theolefin polymer produced per hour by the process is from about 15% toabout 35% greater than the amount of the olefin polymer obtained perhour under the same polymerization conditions without catalyst componentII. In still another aspect, these increases in production rate (e.g.,the amount of polymer produced per hour) can be achieved with a molarratio of catalyst component I to catalyst component II in a range, forexample, from about 6:1 to about 75:1, from about 7:1 to about 50:1,from about 8:1 to about 25:1, or from about 8:1 to about 15:1. Incertain aspects, these increases in production rate can be attained whenthe catalyst component I metallocene contains an alkenyl moiety, and/orwhen the olefin polymer produced by the process is an ethylene copolymerhaving a density in a range from about 0.89 to about 0.93 g/cm³(alternatively, from about 0.90 to about 0.92 g/cm³), and/or when theolefin polymer produced by the process is an ethylene copolymer having amelt index in a range from about 0.1 to about 5 g/10 min (alternatively,from about 0.5 to about 1.5 g/10 min).

In another aspect, the disclosed processes can be methods of increasingpolymer production rate. One such method for increasing the polymerproduction rate of an olefin polymerization process (e.g., a continuouspolymerization process) operating in the presence of a catalystcomposition, wherein the catalyst composition comprises catalystcomponent I, an activator (e.g., an aluminoxane, an activator-support,etc.), and optionally an organoaluminum compound, can compriseintroducing catalyst component II at a molar ratio of catalyst componentI to catalyst component II in a range of from about 6:1 to about 75:1 tothe catalyst composition. Alternatively, catalyst component II can beadded to the catalyst composition to achieve a molar ratio of catalystcomponent I to catalyst component II which falls within a range fromabout 7:1 to about 50:1, from about 8:1 to about 25:1, or from about 8:1to about 15:1. This method for increasing the polymer production rate ofan olefin polymerization process can increase the polymer productionrate (lb/hr) by about 10% to about 50%, by about 10% to about 40%, byabout 15% to about 35%, or by about 15% to about 30%, as compared to thepolymer production rate prior to the addition of catalyst component H.Furthermore, these increases in polymer production rate may be attainedwhen the catalyst component I metallocene contains an alkenyl moiety,and/or when the olefin polymer produced by the process is an ethylenecopolymer having a density in a range from about 0.89 to about 0.93g/cm³ (alternatively, from about 0.90 to about 0.92 g/cm³), and/or whenthe olefin polymer produced by the process is an ethylene copolymerhaving a melt index in a range from about 0.1 to about 5 g/10 min(alternatively, from about 0.5 to about 1.5 g/10 min).

In addition, Applicants contemplate that aspects of this invention mayprovide the aforementioned production rate increases and may tangiblybenefit continuous polymerization processes (e.g., loop slurry, gasphase, solution, and the like, or combinations thereof) in whichproduction runs of a particular polymer grade (e.g., a desired polymerresin grade having a targeted melt index and density) are generally inexcess of approximately 8-12 hours. Additionally, longer production runsof a particular polymer grade, such as in excess of 24 hours, or 36hours, or 48 hours, or 72 hours, or 96 hours, or 120 hours, or 144hours, and so forth, may benefit even more so from the methods ofincreasing polymer production rate and the olefin polymerizationprocesses disclosed herein.

The concentration of the reactants entering the polymerization reactorcan be controlled to produce resins with certain physical and mechanicalproperties. The proposed end-use product that will be formed by thepolymer resin and the method of forming that product ultimately candetermine the desired polymer properties and attributes. Mechanicalproperties include tensile, flexural, impact, creep, stress relaxation,and hardness tests. Physical properties include density, molecularweight, molecular weight distribution, melting temperature, glasstransition temperature, temperature melt of crystallization, density,stereoregularity, crack growth, long chain branching, and rheologicalmeasurements.

This invention is also directed to, and encompasses, the polymersproduced by any of the polymerization processes disclosed herein.Articles of manufacture can be formed from, and/or can comprise, thepolymers produced in accordance with this invention.

Polymers and Articles

If the resultant polymer produced in accordance with the presentinvention is, for example, a polymer or copolymer of ethylene, itsproperties can be characterized by various analytical techniques knownand used in the polyolefin industry. Articles of manufacture can beformed from, and/or can comprise, the ethylene polymers of thisinvention, whose typical properties are provided below.

The processes disclosed herein, utilizing the above-described dualcatalyst systems, may result in a polymer having an increased molecularweight, for instance, an increased weight-average molecular weight (Mw).In some aspects of this invention, the Mw of an olefin polymer producedby the process (comprising catalyst component I, catalyst component II,etc.) is at least 10% greater than a Mw of an olefin polymer obtainedunder the same polymerization conditions without catalyst component II.For instance, the Mw of the olefin polymer produced by the process canbe from about 10% to about 100% greater, from about 15% to about 100%greater, from about 15% to about 75% greater, or from about 15% to about50% greater, than the Mw of the olefin polymer obtained under the samepolymerization conditions without catalyst component II. In anotheraspect, the Mw of the olefin polymer produced by the process is fromabout 10% to about 40% greater than the Mw of the olefin polymerobtained under the same polymerization conditions without catalystcomponent II. In accordance with yet another aspect of this invention,these increases in Mw (e.g., about 10% to about 100%) can be achievedwith a molar ratio of catalyst component I to catalyst component II in arange from about 6:1 to about 75:1, from about 7:1 to about 50:1, fromabout 8:1 to about 25:1, or from about 8:1 to about 15:1, for example.

Likewise, polymerization processes disclosed herein can result inpolymers having a lower melt index (MI) and/or high load melt index(HLMI). In one aspect of this invention, the MI and/or HLMI of an olefinpolymer produced by the process (comprising catalyst component I,catalyst component II, etc.) is at least 10% less than a MI and/or HLMIof an olefin polymer obtained under the same polymerization conditionswithout catalyst component H. For instance, the MI and/or HLMI of theolefin polymer produced by the process can be from about 15% to about80% less, from about 15% to about 70% less, from about 15% to about 60%less, or from about 15% to about 50% less, than the MI and/or HLMI ofthe olefin polymer obtained under the same polymerization conditionswithout catalyst component II. In another aspect, the MI and/or HLMI ofthe olefin polymer produced by the process is from about 20% to about60% less than the MI and/or HLMI of the olefin polymer obtained underthe same polymerization conditions without catalyst component II. Inaccordance with yet another aspect of this invention, these decreases inMI and/or HLMI (e.g., about 15% to about 80%) can be achieved with amolar ratio of catalyst component I to catalyst component II in a rangefrom about 6:1 to about 75:1, from about 7:1 to about 50:1, from about8:1 to about 25:1, or from about 8:1 to about 15:1, for example.

The polymers of ethylene (homopolymers, copolymers, terpolymers, etc.)produced in accordance with the processes of this invention generallyhave a melt index from about 0.01 to about 20 g/10 min. Melt indices inthe range from about 0.1 to about 15 g/10 min, or from about 0.1 toabout 10 g/10 min, are contemplated in some aspects of this invention.For example, a polymer of the present invention can have a melt index ina range from about 0.1 to about 5, from about 0.25 to about 2, or fromabout 0.5 to about 1.5 g/10 min.

The density of ethylene-based polymers produced using the combination ofmetallocene compounds disclosed herein typically falls within the rangefrom about 0.89 to about 0.94 g/cm³, such as, for example, from about0.89 to about 0.92 g/cm³. In one aspect of this invention, the densityof the ethylene polymer is in a range from about 0.90 to about 0.94g/cm³. Yet, in another aspect, the density is in a range from about 0.91to about 0.94 g/cm³ or, alternatively, from about 0.91 to about 0.93g/cm³.

Polymers of ethylene, whether homopolymers, copolymers, terpolymers, andso forth, can be formed into various articles of manufacture. Articleswhich can comprise polymers of this invention include, but are notlimited to, an agricultural film, an automobile part, a bottle, a drum,a fiber or fabric, a food packaging film or container, a food servicearticle, a fuel tank, a geomembrane, a household container, a liner, amolded product, a medical device or material, a pipe, a sheet or tape, atoy, and the like. Various processes can be employed to form thesearticles. Non-limiting examples of these processes include injectionmolding, blow molding, rotational molding, film extrusion, sheetextrusion, profile extrusion, thermoforming, and the like. Additionally,additives and modifiers are often added to these polymers in order toprovide beneficial polymer processing or end-use product attributes.

EXAMPLES

The invention is further illustrated by the following examples, whichare not to be construed in any way as imposing limitations to the scopeof this invention. Various other aspects, embodiments, modifications,and equivalents thereof which, after reading the description herein, maysuggest themselves to one of ordinary skill in the art without departingfrom the spirit of the present invention or the scope of the appendedclaims.

Melt index (MI, g/10 min) was determined in accordance with ASTM D1238at 190° C. with a 2,160 gram weight.

High load melt index (HLMI, g/10 min) was determined in accordance withASTM D1238 at 190° C. with a 21,600 gram weight.

Polymer density was determined in grams per cubic centimeter (g/cc) on acompression molded sample, cooled at about 15° C. per hour, andconditioned for about 40 hours at room temperature in accordance withASTM D1505 and ASTM D1928, procedure C.

Molecular weights and molecular weight distributions were obtained usinga PL 220 SEC high temperature chromatography unit (Polymer Laboratories)with trichlorobenzene (TCB) as the solvent, with a flow rate of 1mL/minute at a temperature of 145° C. BHT(2,6-di-tert-butyl-4-methylphenol) at a concentration of 0.5 g/L wasused as a stabilizer in the TCB. An injection volume of 200 μL was usedwith a nominal polymer concentration of 1.5 mg/mL. Dissolution of thesample in stabilized TCB was carried out by heating at 150° C. for 5hours with occasional, gentle agitation. The columns used were threePLgel Mixed A LS columns (7.8×300 mm) and were calibrated with a broadlinear polyethylene standard (Phillips Marlex® BHB 5003) for which themolecular weight had been determined.

Sulfated alumina was formed by a process wherein alumina waschemically-treated with a sulfate or bisulfate source. Such a sulfate orbisulfate source may include, for example, sulfuric acid, ammoniumsulfate, or ammonium bisulfate. In an exemplary procedure, a commercialalumina sold as W.R. Grace Alumina A was sulfated by impregnation withan aqueous solution containing about 15-20% (NH₄)₂SO₄ or H₂SO₄. Thissulfated alumina was calcined at 550° C. in air (240° C./hr ramp rate),with a 3 hr hold period at this temperature. Afterward, the sulfatedalumina was collected and stored under dry nitrogen, and was usedwithout exposure to the atmosphere.

Examples 1-35 were conducted in a one-gallon stainless steel semi-batchreactor. Isobutane and alkyl aluminum co-catalyst were used in allpolymerization experiments. The typical polymerization procedure wasconducted as follows: alkyl aluminum (TIBA, triisobutylaluminum), theactivator-support (sulfated alumina) and the metallocene were added inorder through a charge port while venting isobutane vapor. The chargeport was closed and about 2 liters of isobutane were added. The contentsof the reactor were stirred and heated to the desired run temperature,and ethylene was then introduced along with the desired amount of1-hexene. Ethylene was fed on demand to maintain the specified pressurefor the specified length of the polymerization run. The reactor wasmaintained and controlled at the desired run temperature throughout thepolymerization. Upon completion, or at a desired time during the run,the ethylene flow was stopped and a sample of the reactor vapor phasewas removed. Thereafter, the reactor pressure was slowly vented off.Alternatively, ethylene flow was again introduced into the reactor andthe reaction was allowed to run additional time until the end of thereaction and the aforementioned vent off. The reactor was opened and thepolymer product was collected and dried under vacuum at approximately50° C. for at least two hours.

Examples 1-2

Hydrogen Generated by Ethylene Feedstock and Sulfated Alumina and TIBA

The conditions employed were a reaction temperature of 95° C., 340 psigethylene feed, 2 L of isobutane, 100 mg sulfated alumina, 0.5-1.0 mg ofthe metallocene, and 0.5 mL, of 1 M TIBA. Calculations based on theseconditions led to an estimated initial vapor volume of 1.27 L and aliquid volume of 2.5 L (for the 1-gallon reaction vessel). Using thisinformation, the reactor vapor sample, and a calibrated micro-C capableof detecting small levels of hydrogen in the vapor space of the reactor,the mole ppm level of hydrogen in the reactor can be determined.

In Example 1, no metallocene, sulfated alumina, or TIBA was charged tothe reactor. The amount of hydrogen observed in the vapor phase samplewas analyzed to be about 6 ppm at the 340 psig pressure.

In Example 2, no metallocene was charged to the reactor. The amount ofhydrogen due to sulfated alumina and TIBA was determined to be about 13ppm.

Examples 3-6

Hydrogen Generated by MET-I-A in Olefin Polymerization

Under the conditions of Example 1, the polymerizations of Examples 3-6utilized 0.5 mg of MET-I-A and the reaction times and amount of 1-hexenecomonomer listed in Table I. Hydrogen was generated even with no1-hexene comonomer present, but higher levels of hydrogen were generatedwhen the comonomer was present, and when reaction time was increased.

TABLE I Hydrogen generation of Examples 3-6. Reaction 1-hexene HydrogenExample Time (min) (g) (ppm) 3  60 0 213 4  60 5 287 5 120 0 297 6 140 5370

Examples 7-20

Hydrogen Generated by MET-I-B, MET-II-A, and Dual Catalyst Using MET-I-Band MET-II-A in Olefin Polymerization

Under the conditions of Example 1, the polymerizations of Examples 7-20utilized 1 mg of MET-I-B, 1 mg of MET-II-A, or 1 mg total of the dualcatalyst (0.5 mg each of MET-I-B and MET-II-A). Table II lists the ppmhydrogen generated for each catalyst system after a 1-hour reaction timeat specific I-hexene comonomer loadings. Interestingly, the hydrogengenerated by the dual catalyst system seemed to track closely with thatof the MET-II-A catalyst, and not with the MET-I-B catalyst.

TABLE II Hydrogen generation of Examples 7-20. 1-hexene Hydrogen ExampleCatalyst (g) (ppm)  7 MET-I-B 0 197  8 MET-I-B 5 226  9 MET-I-B 10 25410 MET-II-A 0 30 11 MET-II-A 5 38 12 MET-II-A 10 45 13 MET-II-A 20 57 14MET-II-A 40 75 15 MET-II-A 80 94 16 DUAL 0 61 17 DUAL 5 80 18 DUAL 10 8019 DUAL 20 100 20 DUAL 40 143

Examples 21-30

Hydrogen Consumed by MET-I-A and Dual Catalysts Using MET-I-A and EitherMET-II-F or MET-II-E in Olefin Polymerization

Examples 21-30 utilized substantially the same conditions as that ofExample 1, except that 4.2 micromoles of MET-I-A and 45 g of 1-hexenewere used at a polymerization temperature of 80° C., 450 psig ethylene,and a reaction time of 30 minutes. No effort was made to increase or tomaximize the production of polymer in Examples 21-30. For Examples24-27, approximately 17 mg of hydrogen were added to the reactor priorto polymerization (the approximate 17 mg addition of hydrogen resultedin approximately 1800 ppm of hydrogen in the vapor phase). A differentreactor was used for Examples 28-30, but the same polymerizationconditions used in Examples 24-27 were employed. Table III lists thefinal ppm hydrogen concentration after 30 minutes at the specifiedconditions, amount of polymer produced, and/or the MI, HLMI, or Mw ofthe polymer produced.

TABLE III Summary of Examples 21-30. 1st 2nd Catalyst 2 Hydrogen Mw/Polymer Example Catalyst Catalyst (micromole) (ppm) MI HLMI 1000 (g) 21MET-I-A — 0 175 0.06 2.59 203 404 22 MET-I-A MET-II-F 0.4 53 — 0.26 316323 23 MET-I-A MET-II-F 4 1 — 0.07 440 98 24 MET-I-A — 0 — 1.10 19.7 123237 25 MET-I-A MET-II-E 0.06 — 0.25 5.1 174 181 26 MET-I-A MET-II-E 0.4— — 0.20 437 104 27 MET-I-A MET-II-E 4 — — 0.13 484 64 28 MET-I-A — 0483 1.23 20.6 — 463 29 MET-I-A MET-II-E 0.4 40 — 0.53 — 223 30 MET-1-AMET-II-F 0.4 78 — 0.46 — 93

Examples 31-35

Hydrogen Consumption by Various 2nd Catalysts

Examples 31-35 utilized substantially the same conditions as that ofExamples 24-27, except that no 1st catalyst was employed. Theapproximate 17 mg addition of hydrogen resulted in approximately 1800ppm of hydrogen in the vapor phase. Table IV lists the ppm hydrogenremaining (hydrogen concentration) after 30 minutes at the specifiedconditions.

TABLE IV Hydrogen consumption of Examples 31-35. 1st 2nd Catalyst 2Hydrogen Example Catalyst Catalyst (micromole) (ppm) 31 None MET-II-F 4<1 32 None MET-II-G 4 13 33 None MET-II-H 4.4 78 34 None Ti(nBuO)₄ 41040 35 None NiBr cat. 4 1394 Notes on Table IV: The 2nd catalyst inExample 34 was titanium (IV) butoxide. The 2nd catalyst in Example 35was (Ph₃P)₂NiBr₂.

Examples 36-40

Olefin Polymerization Runs with MET-I-A and MET-I-A+MET-II-A

The polymerization runs of Examples 36-40 were conducted in a loopreactor as follows. A 27.3-gallon (103.3 L) or 31.2-gallon (118 L)slurry loop reactor was employed as the polymerization reactor.Polymerization runs were carried out under continuous particle formprocess conditions in the loop reactor (also known as a slurry process)by contacting a 1-hexene solution of the metallocene(s) withtriisobutylaluminum (TIBA) and a sulfated alumina activator-support in a300, 500 or 1000-mL stirred autoclave with continuous output to the loopreactor.

Precontacting/postcontacting were carried out in the following manner. ATIBA solution in isobutane and the metallocene solution(s) in I-hexenewere fed as separate streams into a manifold upstream of theactivator-support feeder outlet where they contacted each other and werecombined with isobutane flush. The activator-support was flushed withthe combined solution into the autoclave, briefly contacting theTIBA/metallocene just before entering the autoclave. The combinedsolution flush used to transport the activator-support into theautoclave was set at a rate that would result in a residence time ofapproximately 10-30 minutes in the autoclave, controlled by adjustingthe isobutane flow rate. The total flow from the autoclave then enteredthe loop reactor.

Ethylene used was polymerization grade ethylene (obtained from AirGasSpecialty Gases) which was purified through a column of A201 alumina andactivated at 343° C. in nitrogen. 1-Hexene used was polymerization grade1-hexene (obtained from Chevron Phillips Chemical Company), which wasfurther purified by distillation and subsequently passed through acolumn of AZ300, an alumina molecular sieve hybrid, and activated at343° C. in nitrogen. The loop reactor was a liquid-full, 15.2-cmdiameter, loop reactor, having a volume of either 27.3 gallons (103.3 L)or 31.2 gallons (118 L). Liquid isobutane was used as the diluent.Hydrogen was added at a controlled rate based on the ethylene feed rate.The isobutane was polymerization grade isobutane (obtained fromEnterprise Products) that was further purified by distillation andsubsequently passed through a column of AZ300 molecular sieves andactivated at 343° C. in nitrogen.

Reactor pressure was approximately 590 psig. The reaction temperaturesemployed are listed in Table V. Additionally, the reactor was operatedto have a residence time of about 1.1 to 1.2 hours. Theactivator-support was added through a 0.35-mL circulating ball-checkfeeder and fed to the 300, 500 or 1000-mL autoclave as described above.Metallocene concentrations in the reactor were within a range of about2.4-3.6 parts per million (ppm) of the diluent in the polymerizationreactor. Polymer was removed from the reactor at the rates indicated inTable V and recovered in a flash chamber. A Vulcan dryer was used to drythe polymer under nitrogen at about 60-80° C. for the smaller volumereactor. The larger reactor was used in conjunction with a purge columnoperating in same temperature range.

TIBA concentration in the reactor was in a range of about 39-49 ppm ofthe diluent in the polymerization reactor, as listed in Table V. Aboutone-half of the TIBA was added to the autoclave and the remainder feddirectly to the reactor. To prevent static build-up in the reactor, asmall amount (less than 5 ppm based on the weight of diluent) of acommercial antistatic agent, such as Octastat 3000, was added as needed.The polymerization conditions and resultant polymer properties forExamples 36-40 are listed in Table V. No effort was made to increase orto maximize the production of polymer in Examples 36-40.

The addition of MET-II-A—even at very low molar ratios—resulted in asubstantial increase in polymer molecular weight and, accordingly, asubstantial decrease in polymer melt index. Interestingly, this resultoccurred even though the molecular weight (Mw, Mn) of the polymerproduced by MET-II-A was less than the molecular weight of the polymerproduced by MET-I-A in Examples 37 and 39-40. Also, it should be notedthat Applicants believe that the molecular weight of a polymer thatwould be produced if MET-II-A were used alone in place of MET-I-A inExamples 36 and 38 would be less than the molecular weight of thepolymer produced by MET-I-A in Examples 36 and 38.

TABLE V Polymerization conditions and polymer properties of Examples36-40. Example 36 37 38 39 40 Activator- Sulfated Sulfated SulfatedSulfated Sulfated Support Alumina Alumina Alumina Alumina AluminaMET-I-A to 3.31 2.77 2.92 2.53 2.45 Reactor (ppm) MET-II-A to 0 0.25 00.17 0.16 Reactor (ppm) MET-I-A: — 8.3:1 — 11.2:1 11.5:1 MET-II-A MolarRatio Autoclave 15.4 17.6 14.9 15.9 16.1 Residence Time (min)Co-catalyst TIBA TIBA TIBA TIBA TIBA Type Co-catalyst in 43.37 44.0140.56 46.7 46.48 reactor (ppm) Rx Temp (° F.) 171.4 171.3 171.7 171.8171.8 Hydrogen 0.021 0.011 0.013 0.010 0.011 (mol %) Ethylene 10.4 10.39.9 10.1 10.2 (mol %) 1-hexene 1.66 1.57 1.50 1.74 1.73 (mol %) HydrogenFeed 2.3 2.3 1.6 1.6 1.6 Rate (mlb/hr) Ethylene Feed 43.7 43.7 43.6 43.743.7 Rate (lb/hr) 1-Hexene Feed 5.70 5.38 5.35 5.92 5.94 Rate (lb/hr)Total Isobutane 68.1 67.6 68.2 67.9 67.9 Flow Rate (lb/hr) Solids 39.538.6 38.6 38.2 38.2 Concentration. Wt. % Polymer 47.0 45.5 45.7 45.345.3 Production (lb/hr) Density — 0.9137 — 0.9136 0.9136 (pellets)(g/cc) Density (fluff) 0.9139 0.9119 0.9145 0.9121 0.9120 (g/cc) HLMI(pellets) — 14.6 — 17 17.3 MI (pellets) — 0.88 — 1.01 1.05 HLMI (fluff)44.18 15.7 31.16 16.96 17.75 MI (fluff) 2.62 0.95 1.82 1.05 1.04 Mn/100040.0 38.4 43.9 44.7 44.1 (pellets) Mw/1000 101.3 131.2 112.8 126.0 125.3(pellets) Mw/Mn 2.53 3.42 2.57 2.82 2.84 (pellets)

Constructive Examples 41-44

Constructive Polymerization Runs with MET-I-A, MET-I-A+MET-II-B, andMET-I-A+MET-II-C

Constructive Examples 41-44 are conducted in substantially the samemanner and utilize substantially the same procedures, conditions, etc.,as that of Examples 36-40. For Constructive Examples 41-44, the reactorpressure is approximately 590 psig, the reactor temperature is in the170-175° F. range, and the reactor is operated to have a residence timein the 1.1-1.2 hour range. The metallocene concentrations in the reactorare in a range of about 2.4-3.6 ppm, and the TIBA concentration in thereactor is in a range of about 39-49 ppm, of the diluent in thepolymerization reactor. Other polymerization conditions are similar tothose disclosed in Table V. No effort is made to increase or to maximizethe production of polymer in Constructive Examples 41-44.

Constructive Example 41 utilizes about 3 ppm of MET-I-A and ConstructiveExample 42 utilizes about 2.5 ppm of MET-I-A along with MET-II-B at aMET-I-A:MET-II-B molar ratio in a range from about 6:1 to about 75:1,for instance, about 9:1. Similarly, Constructive Example 43 utilizesabout 3.3 ppm of MET-I-A and Constructive Example 44 utilizes about 2.8ppm of MET-I-A along with MET-II-C at a MET-I-A:MET-II-C molar ratio ina range from about 6:1 to about 75:1, for instance, about 15:1.

It is expected that addition of, respectively, MET-II-B andMET-II-C—even at very low molar ratios—will result in a substantialincrease in polymer molecular weight and, accordingly, a substantialdecrease in polymer melt index.

Constructive Examples 45-46

Constructive Polymerization Runs with Catalyst Component I and CatalystComponent II

Constructive Example 45 utilizes a catalyst composition containingcatalyst component I (e.g., MET-I-A), sulfated alumina, TIBA, but nocatalyst component II. A polymer having a target melt index selectedwithin a range from about 0.1 to about 5 g/10/min, for instance, atarget melt index of 1 g/10 min, is produced using a commercialproduction-scale loop slurry reactor under standard polymerizationconditions. The reactor size is about 27,000 gal, the reactortemperature is in the 170-205° F. range (e.g., 170-185° F.), the reactorpressure is in the 550-750 psig range (e.g., 600-650 psig), the ethyleneweight percent is in the 3-9.5% range (e.g., 5-7%). Hydrogen can beadded, but in Constructive Examples 45-46, hydrogen is not added.Comonomer 1-hexene is added to the polymerization reactor to produce anolefin polymer having a density within the 0.89-0.94 g/cm³ range, forinstance, a density of about 0.91 g/cm³. The production rate for thistarget olefin polymer (i.e., having a 1 MI and 0.91 density) is expectedto be in a range of about 28,000 to about 34,000 lb/hr.

Constructive Example 46 employs a catalyst composition containingcatalyst component I (e.g., MET-I-A), sulfated alumina, TIBA, but alsocontains catalyst component II (e.g., MET-II-A). The molar ratio ofcatalyst component I to catalyst component II is in a range from about6:1 to about 75:1, for instance, about 10:1. The same target olefinpolymer is produced in the loop slurry reactor at the samepolymerization conditions: a melt index of about 1 g/10 min and adensity of about 0.91 g/cm³. The production rate for this target olefinpolymer with the dual catalyst system is expected to increase to a rateof about 38,000 to about 44,000 lb/hr.

Examples 47-48

Large Scale Experimental Polymerization Run with Catalyst Component Iand Catalyst Component II

Example 47 utilized a catalyst composition containing catalyst componentI (MET-I-A), sulfated alumina, and TIBA, but no catalyst component II. Apolymer having a nominal melt index of approximately 1.5 g/10 min, and anominal density of approximately 0.916 g/cm³, was produced. A commercialproduction-scale loop slurry reactor running under standardpolymerization conditions was employed. The reactor size was about27,000 gal, the reactor temperature was in the 170-173° F. range, thereactor pressure was in the 570-615 psig range, and the ethylene weightpercent was in the 5-6% range by weight. Hydrogen was added to thereactor at a rate within the 0.5-0.6 lb/hr range. Continuous productionof the polymer of Example 47 was conducted for over 48 hours. Themaximum production rate for this polymer using only catalyst componentI, averaged over the highest 24-hr period, was approximately 30,800lb/hr.

Example 48 utilized a catalyst composition containing catalyst componentI (MET-I-A), sulfated alumina, and TIBA, but also contained catalystcomponent II (MET-II-A). The molar ratio of catalyst component I tocatalyst component II in the catalyst composition was approximately10:1. The combined metallocene feed rate (MET-I-A plus MET-II-A) to thereactor in Example 48 was the same as the metallocene feed rate ofMET-I-A to the reactor in Example 47. A polymer having a nominal meltindex of approximately 1.3 g/10 min, and a nominal density ofapproximately 0.914 g/cm³, was produced. A commercial production-scaleloop slurry reactor running under standard polymerization conditions wasemployed. The reactor size was about 27,000 gal, the reactor temperaturewas in the 170-173° F. range, the reactor pressure was in the 570-615psig range, and the ethylene weight percent was in the 5-6% range byweight. Hydrogen was added to the reactor at a rate within the 0.6-0.75lb/hr range. Continuous production of the polymer of Example 48 wasconducted for over 48 hours. The maximum production rate for thispolymer using catalyst component I and catalyst component II, averagedover the highest 24-hr period, was approximately 37,500 lb/hr. Theaddition of catalyst component II to the catalyst composition resultedin an increase in the polymer production rate of over 21%.

We claim:
 1. An olefin polymerization process, the process comprising:contacting a catalyst composition with an olefin monomer and optionallyan olefin comonomer under polymerization conditions to produce an olefinpolymer, wherein the catalyst composition comprises catalyst componentI, catalyst component II, an activator-support comprising a solid oxidetreated with an electron-withdrawing anion, and an organoaluminumcompound, wherein a molar ratio of catalyst component I to catalystcomponent II in the catalyst composition is in a range from about 6:1 toabout 75:1; wherein a melt index (MI) of the olefin polymer produced bythe process is at least 10% less than a MI of an olefin polymer obtainedunder the same polymerization conditions without catalyst component II;wherein catalyst component I comprises: a compound having formula (C); acompound having formula (D); or any combination thereof, wherein:formula (C) is

wherein: M³ is Zr or Hf; X⁴ and X⁵ are independently F; Cl; Br, I;methyl; benzyl; phenyl; H; BH₄; OBR₂ or SO₃R, wherein R is an alkyl oraryl group having up to 18 carbon atoms; or a hydrocarbyloxide group, ahydrocarbylamino group, or a hydrocarbylsilyl group, any of which havingup to 18 carbon atoms; E³ is a bridging group selected from: a cyclic orheterocyclic bridging group having up to 18 carbon atoms, a bridginggroup having the formula >E^(3A)R^(7A)R^(8A), wherein E^(3A) is C or Si,and R^(7A) and R^(8A) are independently H or a hydrocarbyl group havingup to 18 carbon atoms, a bridging group having the formula—CR^(7B)R^(8B)—CR^(7C)R^(8C)—, wherein R^(7B), R^(8B), R^(7C), andR^(8C) are independently H or a hydrocarbyl group having up to 10 carbonatoms, or a bridging group having the formula—SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—, wherein R^(7D), R^(8D), R^(7E), andR^(8E) are independently H or a hydrocarbyl group having up to 10 carbonatoms; R⁹ and R¹⁰ are independently H or a hydrocarbyl group having upto 18 carbon atoms; and Cp¹ is a cyclopentadienyl or indenyl group, anysubstituent on Cp¹ is H or a hydrocarbyl or hydrocarbylsilyl grouphaving up to 18 carbon atoms; and formula (D) is

wherein: M⁴ is Zr or Hf; X⁶ and X⁷ are independently F; Cl; Br, I;methyl; benzyl; phenyl; H; BH₄; OBR₂ or SO₃R, wherein R is an alkyl oraryl group having up to 18 carbon atoms; or a hydrocarbyloxide group, ahydrocarbylamino group, or a hydrocarbylsilyl group, any of which havingup to 18 carbon atoms; E⁴ is a bridging group selected from: a cyclic orheterocyclic bridging group having up to 18 carbon atoms, a bridginggroup having the formula >E^(4A)R^(12A)R^(13A), wherein E^(4A) is C orSi, and R^(12A) and R^(13A) are independently H or a hydrocarbyl grouphaving up to 18 carbon atoms, a bridging group having the formula—CR^(12B)R^(13B)—CR^(12C)R^(13C)—, wherein R^(12B), R^(13B), R^(12C),and R^(13C) are independently H or a hydrocarbyl group having up to 10carbon atoms, or a bridging group having the formula—SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—, wherein R^(12D), R^(13D), R^(12E),and R^(13E) are independently H or a hydrocarbyl group having up to 10carbon atoms; and R¹⁴, R¹⁵, R¹⁶, and R¹⁷ are independently H or ahydrocarbyl group having up to 18 carbon atoms; and wherein catalystcomponent II comprises:

 a compound having the formula

 or any combination thereof, wherein: M⁵ is Zr or Hf; X⁸ and X⁹ areindependently F; Cl; Br, I; methyl; benzyl; phenyl; H; BH₄; OBR₂ orSO₃R, wherein R is an alkyl or aryl group having up to 18 carbon atoms;or a hydrocarbyloxide group, a hydrocarbylamino group, or ahydrocarbylsilyl group, any of which having up to 18 carbon atoms; Cp²and Cp³ are independently a cyclopentadienyl or indenyl, any substituenton Cp² and Cp³ is independently H or a hydrocarbyl group having up to 18carbon atoms; and E⁵ is a bridging group having the formula —(CH₂)_(n)—,wherein n is an integer from 2 to 8, inclusive.
 2. The process of claim1, wherein catalyst component I comprises a compound having formula (C),and wherein: X⁴ and X⁵ are independently F, Cl, Br, I, benzyl, phenyl,or methyl; E³ is a bridging group selected from: a cyclopentyl orcyclohexyl group, a bridging group having the formula>E^(3A)R^(7A)R^(8A), wherein E^(3A) is C or Si, and R^(7A) and R^(8A)are independently H, methyl, ethyl, propyl, butyl, pentyl, hexyl,heptyl, octyl, nonyl, decyl, ethenyl, propenyl, butenyl, pentenyl,hexenyl, heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl, or benzyl,a bridging group having the formula —CR^(7B)R^(8B)—CR^(7C)R^(8C)—,wherein R^(7B), R^(8B), R^(7C), and R^(8C) are independently H ormethyl, or a bridging group having the formula—SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—, wherein R^(7D), R^(8D), R^(7E), andR^(8E) are independently H or methyl; and R⁹ and R¹⁰ are independently Hor t-butyl.
 3. The process of claim 1, wherein catalyst component Icomprises a compound having formula (D), and wherein: X⁶ and X⁷ areindependently F, Cl, Br, I, benzyl, phenyl, or methyl; E⁴ is a bridginggroup selected from: a cyclopentyl or cyclohexyl group, a bridging grouphaving the formula >E^(4A)R^(12A)R^(13A), wherein E^(4A) is C or Si, andR^(12A) and R^(13A) are independently H, methyl, ethyl, propyl, butyl,pentyl, hexyl, heptyl, octyl, nonyl, decyl, ethenyl, propenyl, butenyl,pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl,or benzyl, a bridging group having the formula—CR^(12B)R^(13B)—CR^(12C)R^(13C)—, wherein R^(12B), R^(13B), R^(12C),and R^(13C) are independently H or methyl, or a bridging group havingthe formula —SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—, wherein R^(12D),R^(13D), R^(12E), and R^(13E) are independently H or methyl; and R¹⁴,R¹⁵, R¹⁶, and R¹⁷ are independently H or t-butyl.
 4. The process ofclaim 1, wherein catalyst component II comprises:

or a combination thereof.
 5. The process of claim 1, wherein: the molarratio of catalyst component I to catalyst component II in the catalystcomposition is in a range from about 6:1 to about 18:1; and the meltindex (MI) of the olefin polymer produced by the process is from about15% to about 80% less than a MI of an olefin polymer obtained under thesame polymerization conditions without catalyst component II.
 6. Theprocess of claim 1, wherein the catalyst composition is contacted withethylene and an olefin comonomer comprising 1-butene, 1-hexene,1-octene, or a mixture thereof.
 7. The process of claim 6, wherein themelt index (MI) of the olefin polymer produced by the process is fromabout 15% to about 80% less than a MI of an olefin polymer obtainedunder the same polymerization conditions without catalyst component II.8. The process of claim 7, wherein: the process is conducted in a slurryreactor, a gas-phase reactor, a solution reactor, or a combinationthereof; the molar ratio of catalyst component I to catalyst componentII in the catalyst composition is in a range from about 6:1 to about18:1; and the activator-support comprises a fluorided solid oxide and/ora sulfated solid oxide.
 9. The process of claim 7, wherein: a molarratio of catalyst component I to catalyst component II in the catalystcomposition is in a range from about 7:1 to about 50:1; and catalystcomponent I comprises a metallocene compound having the formula:

 wherein: M is Zr or Hf; X¹ and X² are independently F, Cl, Br, I,benzyl, phenyl, or methyl; R¹ and R² are independently H or ahydrocarbyl group having up to 12 carbon atoms; R³ and R⁴ areindependently H or an alkyl group having up to 12 carbon atoms; and R⁵is H or an alkyl or alkenyl group having up to 12 carbon atoms.
 10. Theprocess of claim 9, wherein: X¹ and X² are independently Cl, benzyl,phenyl, or methyl; R¹ and R² are independently methyl, ethyl, propyl,butyl, ethenyl, propenyl, butenyl, pentenyl, hexenyl, benzyl, or phenyl;R³ and R⁴ are independently H or t-butyl; R⁵ is H, methyl, ethyl,propyl, butyl, ethenyl, propenyl, butenyl, pentenyl, or hexenyl; andcatalyst component II comprises:

 or a combination thereof.
 11. The process of claim 7, wherein: the meltindex of the olefin polymer produced by the process is in a range fromabout 0.1 to about 5 g/10 min; and a density of the olefin polymerproduced by the process is in a range from about 0.89 to about 0.94g/cm³.
 12. An olefin polymerization process, the process comprising:contacting a catalyst composition with an olefin monomer and optionallyan olefin comonomer under polymerization conditions to produce an olefinpolymer, wherein the catalyst composition comprises catalyst componentI, catalyst component II, and an activator, wherein the activatorcomprises an aluminoxane compound, an organoboron or organoboratecompound, an ionizing ionic compound, or any combination thereof;wherein a molar ratio of catalyst component I to catalyst component IIin the catalyst composition is in a range from about 6:1 to about 75:1;wherein a melt index (MI) of the olefin polymer produced by the processis at least 10% less than a MI of an olefin polymer obtained under thesame polymerization conditions without catalyst component II; whereincatalyst component I comprises: a compound having formula (C); acompound having formula (D); or any combination thereof, wherein:formula (C) is

wherein: M³ is Zr or Hf; X⁴ and X⁵ are independently F; Cl; Br, I;methyl; benzyl; phenyl; H; BH₄; OBR₂ or SO₃R, wherein R is an alkyl oraryl group having up to 18 carbon atoms; or a hydrocarbyloxide group, ahydrocarbylamino group, or a hydrocarbylsilyl group, any of which havingup to 18 carbon atoms; E³ is a bridging group selected from: a cyclic orheterocyclic bridging group having up to 18 carbon atoms, a bridginggroup having the formula >E^(3A)R^(7A)R^(8A), wherein E^(3A) is C or Si,and R^(7A) and R^(8A) are independently H or a hydrocarbyl group havingup to 18 carbon atoms, a bridging group having the formula—CR^(7B)R^(8B)—CR^(7C)R^(8C)—, wherein R^(7B), R^(8B), R^(7C), andR^(8C) are independently H or a hydrocarbyl group having up to 10 carbonatoms, or a bridging group having the formula—SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—, wherein R^(7D), R^(8D), R^(7E), andR^(8E) are independently H or a hydrocarbyl group having up to 10 carbonatoms; R⁹ and R¹⁰ are independently H or a hydrocarbyl group having upto 18 carbon atoms; and Cp¹ is a cyclopentadienyl or indenyl group, anysubstituent on Cp¹ is H or a hydrocarbyl or hydrocarbylsilyl grouphaving up to 18 carbon atoms; and formula (D) is

wherein: M⁴ is Zr or Hf; X⁶ and X⁷ are independently F; Cl; Br, I;methyl; benzyl; phenyl; H; BH₄; OBR₂ or SO₃R, wherein R is an alkyl oraryl group having up to 18 carbon atoms; or a hydrocarbyloxide group, ahydrocarbylamino group, or a hydrocarbylsilyl group, any of which havingup to 18 carbon atoms; E⁴ is a bridging group selected from: a cyclic orheterocyclic bridging group having up to 18 carbon atoms, a bridginggroup having the formula >E^(4A)R^(12A)R^(13A), wherein E^(4A) is C orSi, and R^(12A) and R^(13A) are independently H or a hydrocarbyl grouphaving up to 18 carbon atoms, a bridging group having the formula—CR^(12B)R^(13B)—CR^(12C)R^(13C)—, wherein R^(12B), R^(13B), R^(12C),and R^(13C) are independently H or a hydrocarbyl group having up to 10carbon atoms, or a bridging group having the formula—SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—, wherein R^(12D), R^(13D), R^(12E),and R^(13E) are independently H or a hydrocarbyl group having up to 10carbon atoms; and R¹⁴, R¹⁵, R¹⁶, and R¹⁷ are independently H or ahydrocarbyl group having up to 18 carbon atoms; and wherein catalystcomponent II comprises:

 a compound having the formula

 or any combination thereof, wherein: M⁵ is Zr or Hf; X⁸ and X⁹ areindependently F; Cl; Br, I; methyl; benzyl; phenyl; H; BH₄; OBR₂ orSO₃R, wherein R is an alkyl or aryl group having up to 18 carbon atoms;or a hydrocarbyloxide group, a hydrocarbylamino group, or ahydrocarbylsilyl group, any of which having up to 18 carbon atoms; Cp²and Cp³ are independently a cyclopentadienyl or indenyl, any substituenton Cp² and Cp³ is independently H or a hydrocarbyl group having up to 18carbon atoms; and E⁵ is a bridging group having the formula —(CH₂)_(n)—,wherein n is an integer from 2 to 8, inclusive.
 13. The process of claim12, wherein catalyst component I comprises a compound having formula(C), and wherein: X⁴ and X⁵ are independently F, Cl, Br, I, benzyl,phenyl, or methyl; E³ is a bridging group selected from: a cyclopentylor cyclohexyl group, a bridging group having the formula>E^(3A)R^(7A)R^(8A), wherein E^(3A) is C or Si, and R^(7A) and R^(8A)are independently H, methyl, ethyl, propyl, butyl, pentyl, hexyl,heptyl, octyl, nonyl, decyl, ethenyl, propenyl, butenyl, pentenyl,hexenyl, heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl, or benzyl,a bridging group having the formula —CR^(7B)R^(8B)—CR^(7C)R^(8C)—,wherein R^(7B), R^(8B), R^(7C), and R^(8C) are independently H ormethyl, or a bridging group having the formula—SiR^(7D)R^(8D)—SiR^(7E)R^(8E)—, wherein R^(7D), R^(8D), R^(7E), andR^(8E) are independently H or methyl; and R⁹ and R¹⁰ are independently Hor t-butyl.
 14. The process of claim 12, wherein catalyst component Icomprises a compound having formula (D), and wherein: X⁶ and X⁷ areindependently F, Cl, Br, I, benzyl, phenyl, or methyl; E⁴ is a bridginggroup selected from: a cyclopentyl or cyclohexyl group, a bridging grouphaving the formula >E^(4A)R^(12A)R^(13A), wherein E^(4A) is C or Si, andR^(12A) and R^(13A) are independently H, methyl, ethyl, propyl, butyl,pentyl, hexyl, heptyl, octyl, nonyl, decyl, ethenyl, propenyl, butenyl,pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, phenyl, tolyl,or benzyl, a bridging group having the formula—CR^(12B)R^(13B)—CR^(12C)R^(13C)—, wherein R^(12B), R^(13B), R^(12C),and R^(13C) are independently H or methyl, or a bridging group havingthe formula —SiR^(12D)R^(13D)—SiR^(12E)R^(13E)—, wherein R^(12D),R^(13D), R^(12E), and R^(13E) are independently H or methyl; and R¹⁴,R¹⁵, R¹⁶, and R¹⁷ are independently H or t-butyl.
 15. The process ofclaim 12, wherein catalyst component II comprises:

or a combination thereof.
 16. The process of claim 12, wherein: themolar ratio of catalyst component I to catalyst component II in thecatalyst composition is in a range from about 6:1 to about 18:1; and themelt index (MI) of the olefin polymer produced by the process is fromabout 15% to about 80% less than a MI of an olefin polymer obtainedunder the same polymerization conditions without catalyst component II.17. The process of claim 12, wherein the catalyst composition iscontacted with ethylene and an olefin comonomer comprising 1-butene,1-hexene, 1-octene, or a mixture thereof.
 18. The process of claim 17,wherein the melt index (MI) of the olefin polymer produced by theprocess is from about 15% to about 80% less than a MI of an olefinpolymer obtained under the same polymerization conditions withoutcatalyst component II.
 19. The process of claim 18, wherein: the processis conducted in a slurry reactor, a gas-phase reactor, a solutionreactor, or a combination thereof; the molar ratio of catalyst componentI to catalyst component II in the catalyst composition is in a rangefrom about 6:1 to about 18:1; and the activator comprises an aluminoxanecompound.
 20. The process of claim 18, wherein: a molar ratio ofcatalyst component I to catalyst component II in the catalystcomposition is in a range from about 7:1 to about 50:1; and catalystcomponent I comprises a metallocene compound having the formula:

 wherein: M is Zr or Hf; X¹ and X² are independently F, Cl, Br, I,benzyl, phenyl, or methyl; R¹ and R² are independently H or ahydrocarbyl group having up to 12 carbon atoms; R³ and R⁴ areindependently H or an alkyl group having up to 12 carbon atoms; and R⁵is H or an alkyl or alkenyl group having up to 12 carbon atoms.
 21. Theprocess of claim 20, wherein: X¹ and X² are independently Cl, benzyl,phenyl, or methyl; R¹ and R² are independently methyl, ethyl, propyl,butyl, ethenyl, propenyl, butenyl, pentenyl, hexenyl, benzyl, or phenyl;R³ and R⁴ are independently H or t-butyl; R⁵ is H, methyl, ethyl,propyl, butyl, ethenyl, propenyl, butenyl, pentenyl, or hexenyl; andcatalyst component II comprises:

 or a combination thereof.
 22. The process of claim 18, wherein: themelt index of the olefin polymer produced by the process is in a rangefrom about 0.1 to about 5 g/10 min; and a density of the olefin polymerproduced by the process is in a range from about 0.89 to about 0.94g/cm³.